An etiopathogenesis is defined as the analysis of the causes and development of a disease or abnormal condition. The term derives from the union of “etiology” and “pathogenesis”, which in the medical field indicate, respectively, the causal factors (etiology) and the mechanism of onset, and subsequent development, of a disease process (pathogenesis).

The etiopathogenesis may be certain (determinable with accuracy), multifactorial (due to several factors), uncertain, unknown or unknown. Most of the most common diseases recognize a multifactorial etiopathogenesis, since origin and development are often due to the interaction of genetic factors (familiality, heredity, small mutations, etc..) with the very important environmental component (diet, physical activity, body weight, smoking habits, stress, alcohol intake, drugs, abuse of various kinds, etc..). The importance of these behavioral factors in the etiopathogenesis of various diseases is highlighted by the fact that their expression in homozygous twins (i.e. with the same genetic heritage) can vary even significantly.

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