disorders caused by some external pathogenic cause. The causes can be external both in relation to the individual himself (for example, in the case of TBI – a blow to the head) and in relation to his brain (i.e. causes associated with any somatic diseases, including damage to the cerebral vessels, tumors of the brain and meninges, intoxication, etc.). An example of an exogenous disorder is alcoholic psychosis. The opposite term is endogenous disorder (see Endogenous disorders in Chapter 2.1. Key psychological concepts in clinical psychology).