define disease
A disease is a particular abnormal condition that negatively affects the structure or function of part or all of an organism. Diseases are often associated with specific signs and symptoms. A disease can be caused by pathogens or internal dysfunctions.
There are four main types of disease: infectious disease, deficiency diseases, hereditary diseases and physiological diseases. Diseases can also be classified as communicable versus non communicable.
The study of diseases is called pathology.
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