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A disease is a particular abnormal condition that negatively affects the structure or function of part or all of an organism, and that is not due to any external injury. Diseases are often construed as medical conditions that are associated with specific symptoms and signs. A disease may be caused by external factors such as pathogens or by internal dysfunctions. For example, internal dysfunctions of 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 afflicted, 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 emotionally, as contracting and living with 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 diseases 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.The study of disease is called pathology, which includes the study of etiology, or cause.

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  1. papersoldier

    In light of the recent Chinese virus problem, I present - Gutter oil!

    This video serves as a good example of how disease can spread so rapidly in countries with such a high disregard for healthy living practices: Video on the use of "gutter oil" in Chinese cooking.
  2. G8rHunter

    Zombie Deer Meat Disease Spreads to 24 States

    Including the link and so far it doesn't appear transferable to humans. I would not eat it to find out. Obviously, spreading but not discovered in Oregon yet. FYI 'Zombie' deer disease is in 24 states and thousands of infected deer are eaten each year, expert warns
  3. ATCclears

    Measles outbreak in Pacific Northwest

    I assume most have seen this, but... Number of confirmed measles cases in Clark County grows to 51 Data point. My Mother-in-law had Measles as a child (before there was a vaccine). She started to go cross-eyed and had to wear an eye patch for a year.
  4. ATCclears

    Using a self-service kiosk? When was it last cleaned?

    Poo found on every McDonald's touchscreen tested | Metro News This observation won't be limited to McDonald's...
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