Summary: An analysis is presented of all emergency calls made in one year, "out of hours," to local authority mental health social workers as part of a comprehensive psychiatric service in an urban community. Of 212 calls received, more related to men than women, and in both sexes the peak age group was 40 to 49 years; 72% of referrals were in the psychosis or personality disorder diagnostic groups. A minority of cases referred had symptoms of only recent onset, and 70% of all calls related to patients previously known to the local services.