The prevalence of medical illnesses is high among patients with psychiatric disorders. The current study aimed to investigate multi-comorbidity in patients with psychiatric disorders in comparison to the general population. Secondary aims were to investigate factors associated with metabolic syndrome and treatment appropriateness of mental disorders.

The sample included 54,826 subjects (64.73% females; 34.15% males; 1.11% nonbinary gender) from 40 countries (COMET-G study). The analysis was based on the registration of previous history that could serve as a fair approximation for the lifetime prevalence of various medical conditions.

About 24.5% reported a history of somatic and 26.14% of mental disorders. Mental disorders were by far the most prevalent group of medical conditions. Comorbidity of any somatic with any mental disorder was reported by 8.21%. One-third to almost two-thirds of somatic patients were also suffering from a mental disorder depending on the severity and multicomorbidity. Bipolar and psychotic patients and to a lesser extent depressives, manifested an earlier (15–20 years) manifestation of somatic multicomorbidity, severe disability, and probably earlier death. The overwhelming majority of patients with mental disorders were not receiving treatment or were being treated in a way that was not recommended. Antipsychotics and antidepressants were not related to the development of metabolic syndrome.

The finding that one-third to almost two-thirds of somatic patients also suffered from a mental disorder strongly suggests that psychiatry is the field with the most trans-specialty and interdisciplinary value and application points to the importance of teaching psychiatry and mental health in medical schools and also to the need for more technocratically oriented training of psychiatric residents.

Adolescents living with HIV (ALWH) are disproportionally impacted by depression, experiencing worse HIV outcomes. Integrated depression and HIV care may support antiretroviral adherence. This study pilot tested for proof of concept a basic depression care pathway for ALWH to inform depression care integration with HIV services in Peru.

ALWH were screened for depression with the Patient Health Questionnaire-9 (PHQ-9). Participants with PHQ-9 scores of ⩾10 or suicidal ideation (SI) were eligible for Psychological First Aid (PFA) delivered by non-mental health specialists. Participants with PHQ-9 re-assessments of ⩾20 or SI were referred to specialized services.

Twenty-eight (11 female, 17 male) ALWH aged 15–21 years participated; n = 20 (71%) identified as heterosexual. Most (18/28) acquired HIV at birth. Baseline PHQ-9 scores were 0–4, n = 3 (11%); 5–9, n = 9 (32%); 10–14, n = 10 (36%); 15–19, n = 4 (14%); and 20–27, n = 2 (7%). Eleven participants (40%) reported SI. Among participants with PHQ-9 > 4, 92% (23/25) were not severe. Of the 21 (75%) of participants eligible for PFA, n = 9 (32%) accepted at least one session, of which n = 3 (33%) were linked to specialized care.

A simple care pathway operationalizing depression screening and non-specialist delivered emotional support is a first step toward integrated depression and HIV care for ALWH.