Participants in this study will undergo a two-part screening interview at the Strong Adult Ambulatory Clinic. This screening will include both written questionnaires and face-to-face interviews regarding any experiences of sexual or physical abuse; suicidal thoughts; family relationships; and current attitudes, thoughts, or feelings. Participants who meet all criteria will then be randomly assigned to receive one of two treatments: interpersonal psychotherapy or individual psychotherapy, which is considered usual care. All treatment sessions will be held at the Strong Adult Ambulatory Clinic. Participants assigned to receive interpersonal psychotherapy will attend weekly 50-minute sessions with a therapist. Interpersonal psychotherapy will focus on current interpersonal stressors in daily life, such as difficulties in close relationships or at work. Treatment will also help participants examine the relationship between their mood changes and interpersonal problems. Participants assigned to receive individual psychotherapy will undergo cognitive-behavioral therapy, supportive counseling, or a combination of the two. Participants will work with their therapists to decide upon a treatment plan designed to help changes in mood and other difficulties in daily life. The number and length of treatment sessions for this group will be determined on an individual basis. For all participants, evaluations consisting of questionnaires similar to those from the initial screening will be completed at mid-treatment, post-treatment, and 3 months after treatment.