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68-419: A disease is a particular abnormal condition that adversely affects the structure or function of all or part of an organism and is not immediately due to any external injury . Diseases are often known to be medical conditions that are associated with specific signs and symptoms . A disease may be caused by external factors such as pathogens or by internal dysfunctions. For example, internal dysfunctions of
136-458: A genetic association (often just "association" in context). By definition, an association indicates that the collection of signs and symptoms occurs in combination more frequently than would be likely by chance alone . Syndromes are often named after the physician or group of physicians that discovered them or initially described the full clinical picture. Such eponymous syndrome names are examples of medical eponyms . Recently, there has been
204-436: A " psychosis ", and described "the three major psychoses" as schizophrenia, epilepsy, and manic-depressive illness . In the field of medical genetics, the term "syndrome" is traditionally only used when the underlying genetic cause is known. Thus, trisomy 21 is commonly known as Down syndrome. Until 2005, CHARGE syndrome was most frequently referred to as "CHARGE association". When the major causative gene ( CHD7 ) for
272-425: A biologist could ask to help explain a behaviour , though they have been generalised to a wider scope. 1) Mechanism: What mechanisms cause the animal to behave as it does? 2) Ontogeny : What developmental mechanisms in the animal's embryology (and its youth, if it learns ) created the structures that cause the behaviour? 3) Function/adaptation: What is the evolutionary function of the behaviour? 4) Evolution: What
340-407: A component of a system to be the causal effect that the component has on the larger containing system. For example, the heart has the actual causal role of pumping blood in the circulatory system; therefore, the function of the heart is to pump blood. This account has been objected to on the grounds that it is too loose a notion of function. For example, the heart also has the causal effect of producing
408-611: A disease can alter the affected person's perspective on life. Death due to disease is called death by natural causes . There are four main types of disease: infectious diseases, deficiency diseases , hereditary diseases (including both genetic and non-genetic hereditary diseases ), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases. The deadliest diseases in humans are coronary artery disease (blood flow obstruction), followed by cerebrovascular disease and lower respiratory infections . In developed countries,
476-424: A disease or other health problems. In the medical field, therapy is synonymous with the word treatment . Among psychologists, the term may refer specifically to psychotherapy or "talk therapy". Common treatments include medications , surgery , medical devices , and self-care . Treatments may be provided by an organized health care system , or informally, by the patient or family members. Preventive healthcare
544-416: A middle ground between causal role and selected effect theories, as with Boorse (1977). Boorse defines the function of a biological trait to be the statistically typical causal contribution of that trait to survival and reproduction. So for example, zebra stripes were sometimes said to work by confusing predators . This role of zebra stripes would contribute to the survival and reproduction of zebras, and that
612-416: A number of positive and negative effects on the financial and other responsibilities of governments, corporations, and institutions towards individuals, as well as on the individuals themselves. The social implication of viewing aging as a disease could be profound, though this classification is not yet widespread. Lepers were people who were historically shunned because they had an infectious disease, and
680-459: A particular disease or disorder. The word derives from the Greek σύνδρομον, meaning "concurrence". When a syndrome is paired with a definite cause this becomes a disease. In some instances, a syndrome is so closely linked with a pathogenesis or cause that the words syndrome , disease , and disorder end up being used interchangeably for them. This substitution of terminology often confuses
748-421: A partly or completely genetic basis (see genetic disorder ) and may thus be transmitted from one generation to another. Social determinants of health are the social conditions in which people live that determine their health. Illnesses are generally related to social, economic, political, and environmental circumstances . Social determinants of health have been recognized by several health organizations such as
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#1732773087086816-458: A person's life was shortened due to a disease. For example, if a person dies at the age of 65 from a disease, and would probably have lived until age 80 without that disease, then that disease has caused a loss of 15 years of potential life. YPLL measurements do not account for how disabled a person is before dying, so the measurement treats a person who dies suddenly and a person who died at the same age after decades of illness as equivalent. In 2004,
884-535: A shift towards naming conditions descriptively (by symptoms or underlying cause) rather than eponymously, but the eponymous syndrome names often persist in common usage. The defining of syndromes has sometimes been termed syndromology, but it is usually not a separate discipline from nosology and differential diagnosis generally, which inherently involve pattern recognition (both sentient and automated ) and differentiation among overlapping sets of signs and symptoms. Teratology (dysmorphology) by its nature involves
952-405: A shorthand way of describing function, even though its applicability is disputed. In contemporary philosophy of biology, there are three major accounts of function in the biological world: theories of causal role, selected effect, and goal contribution. Causal role theories of biological function trace their origin back to a 1975 paper by Robert Cummins. Cummins defines the functional role of
1020-422: A sound, but we would not consider producing sound to be the function of the heart. Selected effect theories of biological functions hold that the function of a biological trait is the function that the trait was selected for , as argued by Ruth Millikan. For example, the function of the heart is pumping blood, for that is the action for which the heart was selected for by evolution. In other words, pumping blood
1088-603: A subset of all medical syndromes. Early texts by physicians noted the symptoms of various maladies and introduced diagnoses based upon those symptoms. For example, Avicenna 's The Canon of Medicine (1025) describes diagnosing pleurisy by its symptoms, including chronic fever, cough, shooting pains, and labored breathing. The 17th century doctor Thomas Sydenham likewise approached diagnoses based upon collections of symptoms. Psychiatric syndromes often called psychopathological syndromes ( psychopathology refers both to psychic dysfunctions occurring in mental disorders , and
1156-416: Is the reason that the heart has evolved. This account has been criticized for being too restrictive a notion of function. It is not always clear which behavior has contributed to the selection of a trait, as biological traits can have functions, even if they have not been selected for. Beneficial mutations are initially not selected for, but they do have functions. Goal contribution theories seek to carve
1224-405: Is a blind process which has no 'goal' for the future. For example, a tree does not grow flowers for any purpose, but does so simply because it has evolved to do so. To say 'a tree grows flowers to attract pollinators ' would be incorrect if the 'to' implies purpose. A function describes what something does , not what its 'purpose' is. However, teleological language is often used by biologists as
1292-442: Is a common metaphor for addictions : The alcoholic is enslaved by drink, and the smoker is captive to nicotine. Some cancer patients treat the loss of their hair from chemotherapy as a metonymy or metaphor for all the losses caused by the disease. Some diseases are used as metaphors for social ills: "Cancer" is a common description for anything that is endemic and destructive in society, such as poverty, injustice, or racism. AIDS
1360-498: Is a way to avoid an injury, sickness, or disease in the first place. A treatment or cure is applied after a medical problem has already started. A treatment attempts to improve or remove a problem, but treatments may not produce permanent cures, especially in chronic diseases . Cures are a subset of treatments that reverse diseases completely or end medical problems permanently. Many diseases that cannot be completely cured are still treatable. Pain management (also called pain medicine)
1428-419: Is an enemy that must be feared, fought, battled, and routed. The patient or the healthcare provider is a warrior , rather than a passive victim or bystander. The agents of communicable diseases are invaders ; non-communicable diseases constitute internal insurrection or civil war . Because the threat is urgent, perhaps a matter of life and death, unthinkably radical, even oppressive, measures are society's and
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#17327730870861496-464: Is called an adaptation ; other characteristics may be non-functional spandrels , though these in turn may later be co-opted by evolution to serve new functions. In biology , function has been defined in many ways. In physiology , it is simply what an organ, tissue, cell or molecule does. In the philosophy of biology , talk of function inevitably suggests some kind of teleological purpose, even though natural selection operates without any goal for
1564-548: Is far more common in societies in which most members live until they reach the age of 80 than in societies in which most members die before they reach the age of 50. An illness narrative is a way of organizing a medical experience into a coherent story that illustrates the sick individual's personal experience. People use metaphors to make sense of their experiences with disease. The metaphors move disease from an objective thing that exists to an affective experience. The most popular metaphors draw on military concepts: Disease
1632-887: Is known. The most known and used classification of diseases is the World Health Organization 's ICD . This is periodically updated. Currently, the last publication is the ICD-11 . Diseases can be caused by any number of factors and may be acquired or congenital . Microorganisms , genetics, the environment or a combination of these can contribute to a diseased state. Only some diseases such as influenza are contagious and commonly believed infectious. The microorganisms that cause these diseases are known as pathogens and include varieties of bacteria, viruses, protozoa, and fungi. Infectious diseases can be transmitted, e.g. by hand-to-mouth contact with infectious material on surfaces, by bites of insects or other carriers of
1700-556: Is that branch of medicine employing an interdisciplinary approach to the relief of pain and improvement in the quality of life of those living with pain. Treatment for medical emergencies must be provided promptly, often through an emergency department or, in less critical situations, through an urgent care facility. Epidemiology is the study of the factors that cause or encourage diseases. Some diseases are more common in certain geographic areas, among people with certain genetic or socioeconomic characteristics, or at different times of
1768-400: Is that diseases often cannot be defined and classified clearly, especially when cause or pathogenesis are unknown. Thus diagnostic terms often only reflect a symptom or set of symptoms ( syndrome ). Classical classification of human disease derives from the observational correlation between pathological analysis and clinical syndromes. Today it is preferred to classify them by their cause if it
1836-418: Is the phylogeny of the behaviour, or in other words, when did it first appear in the evolutionary history of the animal? The questions are interdependent, so that, for example, adaptive function is constrained by embryonic development. Function is not the same as purpose in the teleological sense, that is, possessing conscious mental intention to achieve a goal. In the philosophy of biology , evolution
1904-429: Is the reason some object or process occurred in a system that evolved through natural selection . That reason is typically that it achieves some result, such as that chlorophyll helps to capture the energy of sunlight in photosynthesis . Hence, the organism that contains it is more likely to survive and reproduce, in other words the function increases the organism's fitness . A characteristic that assists in evolution
1972-401: Is why confusing predators would be said to be the function of zebra stripes. Under this account, whether or not a particular causal role of a trait is its function depends on whether that causal role contributes to the survival and reproduction of that organism. Syndrome A syndrome is a set of medical signs and symptoms which are correlated with each other and often associated with
2040-476: The Hmong people . Sickness confers the social legitimization of certain benefits, such as illness benefits, work avoidance, and being looked after by others. The person who is sick takes on a social role called the sick role . A person who responds to a dreaded disease, such as cancer , in a culturally acceptable fashion may be publicly and privately honored with higher social status . In return for these benefits,
2108-450: The World Health Organization calculated that 932 million years of potential life were lost to premature death. The quality-adjusted life year (QALY) and disability-adjusted life year (DALY) metrics are similar but take into account whether the person was healthy after diagnosis. In addition to the number of years lost due to premature death, these measurements add part of the years lost to being sick. Unlike YPLL, these measurements show
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2176-470: The acute phase ; after recovery from chickenpox, the virus may remain dormant in nerve cells for many years, and later cause herpes zoster (shingles). Diseases may be classified by cause, pathogenesis ( mechanism by which the disease is caused), or by symptoms . Alternatively, diseases may be classified according to the organ system involved, though this is often complicated since many diseases affect more than one organ. A chief difficulty in nosology
2244-809: The immune system can produce a variety of different diseases, including various forms of immunodeficiency , hypersensitivity , allergies , and autoimmune disorders . In humans, disease is often used more broadly to refer to any condition that causes pain , dysfunction , distress , social problems , or death to the person affected, or similar problems for those in contact with the person. In this broader sense, it sometimes includes injuries , disabilities , disorders , syndromes , infections , isolated symptoms, deviant behaviors , and atypical variations of structure and function, while in other contexts and for other purposes these may be considered distinguishable categories. Diseases can affect people not only physically but also mentally, as contracting and living with
2312-462: The incubation period is the time between infection and the appearance of symptoms. The latency period is the time between infection and the ability of the disease to spread to another person, which may precede, follow, or be simultaneous with the appearance of symptoms. Some viruses also exhibit a dormant phase, called viral latency , in which the virus hides in the body in an inactive state. For example, varicella zoster virus causes chickenpox in
2380-429: The syndrome nomenclature. In other instances, a syndrome is not specific to only one disease. For example, toxic shock syndrome can be caused by various toxins; another medical syndrome named as premotor syndrome can be caused by various brain lesions; and premenstrual syndrome is not a disease but simply a set of symptoms. If an underlying genetic cause is suspected but not known, a condition may be referred to as
2448-588: The Public Health Agency of Canada and the World Health Organization to greatly influence collective and personal well-being. The World Health Organization's Social Determinants Council also recognizes Social determinants of health in poverty . When the cause of a disease is poorly understood, societies tend to mythologize the disease or use it as a metaphor or symbol of whatever that culture considers evil. For example, until
2516-411: The bacterial cause of tuberculosis was discovered in 1882, experts variously ascribed the disease to heredity , a sedentary lifestyle , depressed mood , and overindulgence in sex, rich food, or alcohol, all of which were social ills at the time. When a disease is caused by a pathogenic organism (e.g., when malaria is caused by Plasmodium ), one should not confuse the pathogen (the cause of
2584-456: The burden imposed on people who are very sick, but who live a normal lifespan. A disease that has high morbidity, but low mortality, has a high DALY and a low YPLL. In 2004, the World Health Organization calculated that 1.5 billion disability-adjusted life years were lost to disease and injury. In the developed world, heart disease and stroke cause the most loss of life, but neuropsychiatric conditions like major depressive disorder cause
2652-562: The challenge of defining them. Especially for poorly understood diseases, different groups might use significantly different definitions. Without an agreed-on definition, different researchers may report different numbers of cases and characteristics of the disease. Some morbidity databases are compiled with data supplied by states and territories health authorities, at national levels or larger scale (such as European Hospital Morbidity Database (HMDB)) which may contain hospital discharge data by detailed diagnosis, age and sex. The European HMDB data
2720-489: The condition was discovered, the name was changed. The consensus underlying cause of VACTERL association has not been determined, and thus it is not commonly referred to as a "syndrome". In biology, "syndrome" is used in a more general sense to describe characteristic sets of features in various contexts. Examples include behavioral syndromes , as well as pollination syndromes and seed dispersal syndromes . In orbital mechanics and astronomy, Kessler syndrome refers to
2788-413: The defining of congenital syndromes that may include birth defects (pathoanatomy), dysmetabolism (pathophysiology), and neurodevelopmental disorders . When there are a number of symptoms suggesting a particular disease or condition but does not meet the defined criteria used to make a diagnosis of that disease or condition. This can be a bit subjective because it is ultimately up to the clinician to make
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2856-406: The diagnosis. This could be because it has not advanced to the level or passed a threshold or just similar symptoms cause by other issues. Subclinical is synonymous since one of its definitions is "where some criteria are met but not enough to achieve clinical status"; but subclinical is not always interchangeable since it can also mean "not detectable or producing effects that are not detectable by
2924-558: The disease were portrayed in literature as having risen above daily life to become ephemeral objects of spiritual or artistic achievement. In the 20th century, after its cause was better understood, the same disease became the emblem of poverty, squalor, and other social problems. Signs and symptoms Syndrome Disease Medical diagnosis Differential diagnosis Prognosis Acute Chronic Cure Eponymous disease Acronym or abbreviation Remission Function (biology) In evolutionary biology , function
2992-528: The disease) with disease itself. For example, West Nile virus (the pathogen) causes West Nile fever (the disease). The misuse of basic definitions in epidemiology is frequent in scientific publications. Many diseases and disorders can be prevented through a variety of means. These include sanitation , proper nutrition , adequate exercise , vaccinations and other self-care and public health measures, such as obligatory face mask mandates . Medical therapies or treatments are efforts to cure or improve
3060-509: The disease, and from contaminated water or food (often via fecal contamination), etc. Also, there are sexually transmitted diseases . In some cases, microorganisms that are not readily spread from person to person play a role, while other diseases can be prevented or ameliorated with appropriate nutrition or other lifestyle changes. Some diseases, such as most (but not all ) forms of cancer , heart disease , and mental disorders, are non-infectious diseases . Many non-infectious diseases have
3128-443: The diseases that cause the most sickness overall are neuropsychiatric conditions , such as depression and anxiety . The study of disease is called pathology , which includes the study of etiology , or cause. In many cases, terms such as disease , disorder , morbidity , sickness and illness are used interchangeably; however, there are situations when specific terms are considered preferable. In an infectious disease,
3196-642: The documentation of results for submission to peer-reviewed journals. Epidemiologists also study the interaction of diseases in a population, a condition known as a syndemic . Epidemiologists rely on a number of other scientific disciplines such as biology (to better understand disease processes), biostatistics (the current raw information available), Geographic Information Science (to store data and map disease patterns) and social science disciplines (to better understand proximate and distal risk factors). Epidemiology can help identify causes as well as guide prevention efforts. In studying diseases, epidemiology faces
3264-428: The effect where the density of objects in low Earth orbit (LEO) is high enough that collisions between objects could cause a cascade in which each collision generates space debris that increases the likelihood of further collisions. In quantum error correction theory syndromes correspond to errors in code words which are determined with syndrome measurements, which only collapse the state on an error state, so that
3332-407: The error can be corrected without affecting the quantum information stored in the code words. There is no set common convention for the naming of newly identified syndromes. In the past, syndromes were often named after the physician or scientist who identified and described the condition in an initial publication. These are referred to as "eponymous syndromes". In some cases, diseases are named after
3400-517: The future. All the same, biologists often use teleological language as a shorthand for function. In contemporary philosophy of biology, there are three major accounts of function in the biological world: theories of causal role, selected effect, and goal contribution. In physiology , a function is an activity or process carried out by a system in an organism , such as sensation or locomotion in an animal. This concept of function as opposed to form (respectively Aristotle's ergon and morphê )
3468-465: The mild disorders, consists of five syndromes: emotional, paranoid, hysterical , delirious , and impulsive. The second, intermediate, group includes two syndromes: schizophrenic syndrome and speech-hallucinatory syndrome . The third includes the most severe disorders, and consists of three syndromes: epileptic , oligophrenic and dementia . In Kraepelin's era, epilepsy was viewed as a mental illness; Karl Jaspers also considered "genuine epilepsy"
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#17327730870863536-641: The month of Ramadan is exempted from the requirement, or even forbidden from participating. People who are sick are also exempted from social duties. For example, ill health is the only socially acceptable reason for an American to refuse an invitation to the White House . The identification of a condition as a disease, rather than as simply a variation of human structure or function, can have significant social or economic implications. The controversial recognition of diseases such as repetitive stress injury (RSI) and post-traumatic stress disorder (PTSD) has had
3604-481: The most years lost to being sick. How a society responds to diseases is the subject of medical sociology . A condition may be considered a disease in some cultures or eras but not in others. For example, obesity was associated with prosperity and abundance, and this perception persists in many African regions, especially since the beginning of the HIV/AIDS . Epilepsy is considered a sign of spiritual gifts among
3672-481: The non-possessive form, while European references often use the possessive. A 2009 study demonstrated a trend away from the possessive form in Europe in medical literature from 1970 through 2008. Even in syndromes with no known etiology , the presence of the associated symptoms with a statistically improbable correlation normally leads the researchers to hypothesize that there exists an unknown underlying cause for all
3740-448: The patient who initially presents with symptoms, or their home town ( Stockholm syndrome ). There have been isolated cases of patients being eager to have their syndromes named after them, while their physicians are hesitant. When a syndrome is named after a person, there is some difference of opinion as to whether it should take the possessive form or not (e.g. Down syndrome vs. Down's syndrome). North American usage has tended to favor
3808-466: The patient's moral duty as they courageously mobilize to struggle against destruction. The War on Cancer is an example of this metaphorical use of language. This language is empowering to some patients, but leaves others feeling like they are failures. Another class of metaphors describes the experience of illness as a journey: The person travels to or from a place of disease, and changes himself, discovers new information, or increases his experience along
3876-441: The philosophy of biology. A functional characteristic is known in evolutionary biology as an adaptation , and the research strategy for investigating whether a character is adaptive is known as adaptationism . Although assuming that a character is functional may be helpful in research, some characteristics of organisms are non-functional, formed as accidental spandrels , side effects of neighbouring functional systems. From
3944-428: The point of view of natural selection , biological functions exist to contribute to fitness , increasing the chance that an organism will survive to reproduce . For example, the function of chlorophyll in a plant is to capture the energy of sunlight for photosynthesis , which contributes to evolutionary success . The ethologist Niko Tinbergen named four questions, based on Aristotle 's Four Causes , that
4012-471: The reality and meaning of medical diagnoses. This is especially true of inherited syndromes. About one third of all phenotypes that are listed in OMIM are described as dysmorphic, which usually refers to the facial gestalt. For example, Down syndrome , Wolf–Hirschhorn syndrome , and Andersen–Tawil syndrome are disorders with known pathogeneses, so each is more than just a set of signs and symptoms, despite
4080-402: The sick person is obligated to seek treatment and work to become well once more. As a comparison, consider pregnancy , which is not interpreted as a disease or sickness, even if the mother and baby may both benefit from medical care. Most religions grant exceptions from religious duties to people who are sick. For example, one whose life would be endangered by fasting on Yom Kippur or during
4148-1676: The study of the origin, diagnosis, development, and treatment of mental disorders). In Russia those psychopathological syndromes are used in modern clinical practice and described in psychiatric literature in the details: asthenic syndrome , obsessive syndrome , emotional syndromes (for example, manic syndrome , depressive syndrome), Cotard's syndrome , catatonic syndrome , hebephrenic syndrome, delusional and hallucinatory syndromes (for example, paranoid syndrome, paranoid-hallucinatory syndrome, Kandinsky - Clérambault's syndrome also known as syndrome of psychic automatism, hallucinosis), paraphrenic syndrome , psychopathic syndromes (includes all personality disorders), clouding of consciousness syndromes (for example, twilight clouding of consciousness, amential syndrome also known as amentia, delirious syndrome , stunned consciousness syndrome, oneiroid syndrome ), hysteric syndrome, neurotic syndrome , Korsakoff's syndrome , hypochondriacal syndrome , paranoiac syndrome, senestopathic syndrome, encephalopathic syndrome . Some examples of psychopathological syndromes used in modern Germany are psychoorganic syndrome , depressive syndrome, paranoid-hallucinatory syndrome, obsessive-compulsive syndrome , autonomic syndrome, hostility syndrome, manic syndrome , apathy syndrome . Münchausen syndrome , Ganser syndrome , neuroleptic-induced deficit syndrome , olfactory reference syndrome are also well-known. The most important psychopathological syndromes were classified into three groups ranked in order of severity by German psychiatrist Emil Kraepelin (1856—1926). The first group, which includes
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#17327730870864216-826: The term "leper" still evokes social stigma . Fear of disease can still be a widespread social phenomenon, though not all diseases evoke extreme social stigma. Social standing and economic status affect health. Diseases of poverty are diseases that are associated with poverty and low social status; diseases of affluence are diseases that are associated with high social and economic status. Which diseases are associated with which states vary according to time, place, and technology. Some diseases, such as diabetes mellitus , may be associated with both poverty (poor food choices) and affluence (long lifespans and sedentary lifestyles), through different mechanisms. The term lifestyle diseases describes diseases associated with longevity and that are more common among older people. For example, cancer
4284-427: The usual clinical tests"; i.e., asymptomatic. In medicine, a broad definition of syndrome is used, which describes a collection of symptoms and findings without necessarily tying them to a single identifiable pathogenesis. Examples of infectious syndromes include encephalitis and hepatitis , which can both have several different infectious causes. The more specific definition employed in medical genetics describes
4352-450: The way. He may travel "on the road to recovery" or make changes to "get on the right track" or choose "pathways". Some are explicitly immigration-themed: the patient has been exiled from the home territory of health to the land of the ill, changing identity and relationships in the process. This language is more common among British healthcare professionals than the language of physical aggression. Some metaphors are disease-specific. Slavery
4420-430: The year. Epidemiology is considered a cornerstone methodology of public health research and is highly regarded in evidence-based medicine for identifying risk factors for diseases. In the study of communicable and non-communicable diseases, the work of epidemiologists ranges from outbreak investigation to study design, data collection, and analysis including the development of statistical models to test hypotheses and
4488-519: Was central in biological explanations in classical antiquity . In more modern times it formed part of the 1830 Cuvier–Geoffroy debate , where Cuvier argued that an animal's structure was driven by its functional needs, while Geoffroy proposed that each animal's structure was modified from a common plan. Function can be defined in a variety of ways, including as adaptation, as contributing to evolutionary fitness, in animal behaviour, and, as discussed below, also as some kind of causal role or goal in
4556-407: Was seen as a divine judgment for moral decadence, and only by purging itself from the "pollution" of the "invader" could society become healthy again. More recently, when AIDS seemed less threatening, this type of emotive language was applied to avian flu and type 2 diabetes mellitus . Authors in the 19th century commonly used tuberculosis as a symbol and a metaphor for transcendence . People with
4624-510: Was submitted by European countries to the World Health Organization Regional Office for Europe. Disease burden is the impact of a health problem in an area measured by financial cost, mortality, morbidity, or other indicators. There are several measures used to quantify the burden imposed by diseases on people. The years of potential life lost (YPLL) is a simple estimate of the number of years that
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