Personality changes UMLS:C0240735 HP:0000751 Personality changes Personality change SNOMEDCT_US:192073007 SNOMEDCT_US:102943000 This term refers to changes in personality that are perceived as abnormal. It does not refer to the usual gradual personality changes that tend to accompany aging and certain life situations. An abnormal shift in patterns of thinking, acting, or feeling. Impairment in personality functioning