Deep Brain Stimulation (DBS) is a surgery where doctors put wires that can carry corrective electric signals inside a patient's brain. Electronic equipment located outside the brain can then send signals to specific parts of the person's brain. DBS is used to treat many diseases. DBS has been used to treat pain disorder, Parkinson's disease, major depressive disorder, obsessive-compulsive disorder, and Tourette syndrome. The Food and Drug Administration approved DBS as a treatment for tremors in 1997, for Parkinson's disease in 2002, Tourette syndrome in 1999, and dystonia in 2003. DBS is helpful for most patients but there can be serious complications and side effects.