Behavioural, psychological and cognitive disturbance have been associated with hypothyroidism, even it has been suggested that this symptoms may remain despite adequate replacement therapy with thyroxine.

To describe prevalence, sociodemographics and clinical features of patients with hypothyroidism in an acute psychiatric unit.

To know about the relation between hypothyroidism and psychiatric symptoms.

Data base collection of all patients admitted between 2010 and 2014 in the acute unit of our psychiatric hospital in Barcelona, was analyzed using SPSS program.

In all 3.1% of the 4536 total patients had hypothyroidism. Among them, 46% were duplicate cases. Mean age was 53±14.27years. A total of 82.7% were woman. Patients having a TSH lower than 0.30 were 12%, TSH normal were 60.2%, TSH higher than 5 were 27.8%. Most frequent Levothyroxine dosage was: 75μg (22.1%), 100μg (19%), 25μg (12.5%) and 125μg (12.5%). Diagnosis more frequently associated with hypothyroidism was: Bipolar (26.5%), Schizophrenia (20%), Depression (15.1%), Unspecified psychosis (10%), Personality disorder (10%), Schizoaffective disorder (7.2%), Paranoia 4.3%.

Most of patients were stable of thyroid condition when had been admitted to our hospital. Hypothyroidism could be a relapse factor, even when treatment is adequate. Affective disorders are more frequently related with hypothyroidism (lithium has to be consider a confounding factor).