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What is DISEASE? What does DISEASE mean? DISEASE meaning, definition, explanation & pronunciation.

A disease is a particular abnormal condition, a disorder of a structure or function, that affects part or all of an organism.

The causal study of disease is called pathology. Disease is often construed as a medical condition associated with specific symptoms and signs. It may be caused by external factors such as pathogens, or it may be caused by internal dysfunctions, such as autoimmune diseases. Diseases usually affect people not only physically, but also emotionally, as contracting and living with a disease can alter one’s perspective on life as well as one’s personality.

Death due to disease is called death by natural causes. There are four main types of disease: infectious disease, deficiency disease, genetic disease, and physiological disease. Diseases can also be classified as communicable and non-communicable.

The deadliest diseases in humans are coronary artery disease (blood flow obstruction), followed by cerebrovascular disease and lower respiratory infections.