What is the difference between a disease, a syndrome and a disorder?


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A disease is a definite pathological process having a characteristic set of signs and symptoms.  It may affect the whole body or any of its parts, and its etiology, pathology, and prognosis may be known or unknown. 

A disorder is a derangement or abnormality of function; a morbid physical or mental state.

A syndrome is a group of symptoms that consistently occur together or a condition characterized by a set of associated symptoms.

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