dysthymic disorder A mood disorder that involves the presence of a low mood almost daily over a span of at least two years. DOID:12139 ICD9CM:300.4 MSH:D019263 NCI:C34562 SNOMEDCT_2010_1_31:192384008 SNOMEDCT_2010_1_31:78667006 UMLS_CUI:C0013415 disease_ontology dysthymia 300.4 Is characterised by at least 2 years of depressed mood for more days than not, accompanied by additional depressive symptoms that do not meet the criteria for a major depressive episode. DSM-IV-TR (american Psychiatric Association) F34.1 MFOMD_0000194 Dysthymic disorder must have the precedes, while depressed, of two (or more) of the following: (1) poor appetite or overeating (2) insomnia or hypersomnia (3) low energy or fatigue (4) low self-esteem (5) poor concentration or difficulty making decisions (6) feelings of hopelessness mood disorder