At the current stage of medical science, the effectiveness of treatment depends not only on the professionalism of physicians, but also on the responsibility of the patients themselves. Low adherence has been proven to be a significant cause of the reduced therapy effectiveness and quality of life, increased risk of complications and treatment costs, worsening of disease prognosis, and reduced patient life expectancy. According to WHO reports, more than 250 factors can influence the adherence to the treatment. Until now, no "gold standard" has been developed for the assessment of adherence to treatment. Patients with psoriasis typically face social stigmatization and rejection, with subsequent profound effects on self-confidence, self-esteem, and feeling of psycho-emotional discomfort. Comorbidity of arthritis affects the psycho-emotional status of patients even more seriously. The purpose of the study is to analyze the psycho-emotional state, adherence to treatment, medical support and recommendations for lifestyle modification in patients with erosive form of psoriatic arthritis comorbidity. 60 patients with a reliable diagnosis of psoriatic arthritis and comorbid pathology were included in the study. Patients with psoriatic arthritis and comorbidity had mainly an average level of adherence to medication, medical support, and a low level of adherence to recommendations for lifestyle modifications. Taking oral glucocorticosteroids was associated with high adherence to drug therapy, while low adherence to medical care was associated with psychoemotional disorders such as anxiety and depression.