Physical therapy was a form of medical treatment involving the training of the body.
In 2375, Nog remained under constant psychiatric care for two months following the loss of his leg. After that time, it was revealed that his counseling sessions were going nowhere, because he was sick of talking about his feelings, and he began showing signs of depression: sleeping over 18 hours a day, and purposely missing his last two physical therapy appointments. (DS9: "It's Only a Paper Moon")