Idiogenic

Idiogenic refers to something that originates from within an individual. It is often used in contrast to exogenous, which means originating from external causes. In medical contexts, the term can describe processes or conditions that arise spontaneously or from internal factors rather than from external stimuli or agents. For instance, idiogenic pain would be pain that arises without a clear external cause or injury, possibly stemming from internal physiological mechanisms or neurological dysfunction. Similarly, an idiogenic response in the body refers to a reaction that is generated internally. The concept is useful for distinguishing between internal and external influences on bodily functions, diseases, or behaviors. It implies a self-generated source or cause.