We will try to demonstrate this problem using the case of a patient who has a number of symptoms which are all related to different diagnoses.

We will describe a patient with a difficult life story which started in his early youth and which could potentially be the cause of his personality disorder, borderline, showing some symptoms of schizoid and compulsive personality disorder and recurrent depressive disorder which developed later in life. Some authors claim that when borderline personality disorder and depressive disorder are comorbid, they are sometimes not dependent upon each other during treatment, but more often improvements in depressive disorder are related to improvements in borderline personality disorder. Some authors have tested the hypothesis that in the population of older patients with depressive disorder, those with personality disorder who developed depression earlier in life (before 18 years of age) prevail in comparison with those who developed depression later. the problem with this patient is that he shows some traits characteristic of personality disorders from all 3 groups. the method used for treating this patient consists of using pharmacotherapeutic measures to treat the symptoms of depression, and psychotherapeutic approach for treating personality disorder (disorders).