Psychiatry is the understanding, assessment, diagnosis and treatment of mental, emotional, and behavioral disorders. Psychiatrists assess patients, make diagnoses, investigate medical problems, offer advice, and recommend different treatments including medication, counselling or other lifestyle interventions. They work in General Hospitals, Psychiatric Hospitals, Prisons and various community locations. Specialties of psychiatry include General Adult Psychiatry, Child and Adolescent Psychiatry, Psychiatry of Old Age, Learning Disability Psychiatry, Addiction Psychiatry, Social & Rehabilitation Psychiatry, Forensic Psychiatry, Psychotherapy and Liaison Psychiatry. Treatments used in Psychiatry include various forms of psychotherapy (talk therapy), medications, psychosocial interventions and electroconvulsive therapy (ECT), depending on the needs of each patient. ECT involves applying electrical currents to the brain, to treat severe depression that has not responded to other treatments. Deep brain stimulation (DBS), vagus nerve stimulation (VNS), and transcranial magnetic stimulation (TMS) are also used. Specifically, psychiatry can help to treat anxiety, phobias, obsessive compulsive disorder (OCD), post-traumatic stress disorder (PTSD), personality disorders, schizophrenia and paranoia, depression and bipolar disorder, and addictions such as drug or alcohol misuse. Psychiatry may be combined with medication to help treat mental disorders. The medications can help correct imbalances in brain chemistry that are thought to be involved in some mental disorders. The classes of medications are Antidepressants, Antipsychotic medications, Sedatives and anxiolytics, Hypnotics, Mood stabilizers, Stimulants.