What is disease?

Disease

A disease is an abnormal condition affecting the body of an organism. It is often construed to be a medical condition associated with specific symptoms and signs. It may be caused by external factors, such as infectious disease, or it may be caused by internal dysfunctions, such as autoimmune diseases. 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 usually affect people not only physically, but also emotionally, as contracting and living with many diseases can alter one's perspective on life, and their personality.

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Famous quotes containing the word disease:

    The inconveniences and horrors of the pox are perfectly well known to every one; but still the disease flourishes and spreads. Several million people were killed in a recent war and half the world ruined; but we all busily go on in courses that make another event of the same sort inevitable. Experientia docet? Experientia doesn’t.
    Aldous Huxley (1894–1963)

    War is in truth a disease in which the juices that serve health and maintenance are used for the sole purpose of nourishing something foreign, something at odds with nature.
    Johann Wolfgang Von Goethe (1749–1832)

    Health is a state of complete physical, mental and social well-being, and not merely the absence of disease or infirmity.
    —Constitution of the World Health Organization.