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Content: Many health care professionals do this, including: Primary care doctor: These doctors are either MDs or DOs who have general knowledge in treating a wide variety of common conditions. They are sometimes called general practionioners. Physician assistant (PA): These caregivers are not doctors, but they are trained to identify symptoms of mental illness and to treat mental disorders under a doctor’s supervision. Nurse practitioner: These registered nurses (RNs) have extra training, including some background in treating psychiatric problems. Psychiatrist: These are medical doctors (MDs) who specialize in the diagnosis and treatment of mental illnesses.