FUNCTIONAL DISORDER By N., Pam M.S. - May 11, 2013 the term given to a disorder that there is no known organic basis. In psychology and psychiatry a functional disorders are improperly considered equivalent to a psychogenic disorder. FUNCTIONAL DISORDER: "Joe had a functional disorder with no cause." Related Psychology Terms SOMATIC DISORDER FUNCTIONAL MOOD DISORDER BRADYCARDIA ATYPICAL DISORDER PSYCHOLOGICAL FACTORS ORGANIC-AFFECTIVE SYNDROME BEHAVIORAL PEDIATRICS MENTAL DISORDER ORGANIC BRAIN SYNDROMES Cite this page: N., Pam M.S., "FUNCTIONAL DISORDER," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/functional-disorder/ (accessed February 15, 2020).