Up to 30 percent of patients with cancer experience depression during the course of their illness. Symptoms of depression such as fatigue, sleep disturbances, or difficulty concentrating may be caused by the tumor itself, notes psychiatrist William Breitbart of Memorial Sloan-Kettering Cancer Center. Depending on the severity and duration of symptoms, patients may experience relief with antidepressant therapy, psychotherapy, or a combination of these approaches.
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