Deep brain stimulation (DBS) involves implanting electrodes within areas of the brain. The electrodes produce electrical impulses that affect brain activity to treat certain medical conditions. The electrical impulses also can affect cells and chemicals within the brain that cause medical conditions. The amount of stimulation in deep brain stimulation is controlled by a pacemaker-like device placed under the skin in the upper chest. A wire that travels under the skin connects this device to the electrodes in the brain. Deep brain stimulation is commonly used to treat a number of conditions, such as: Parkinson's disease. Essential tremor. Conditions that cause dystonia, such as Meige syndrome. Epilepsy. Tourette syndrome. Obsessive-compulsive disorder. Deep brain stimulation also is being studied as a potential treatment for: Chorea, such as Huntington's disease. Chronic pain. Cluster headache. Dementia. Depression. Addiction. Obesity.