Huntington's disease is a genetic neurological disorder that causes the progressive breakdown of nerve cells in the brain. It typically manifests in a person's 30s or 40s with motor, cognitive, and psychiatric symptoms. The motor symptoms include involuntary writhing movements and problems with voluntary movement. Cognitive symptoms involve difficulties with tasks, flexibility, impulsivity, and processing speed. Common psychiatric issues are depression, OCD, mania, and bipolar disorder. The disease is caused by a loss of GABA and acetylcholine-producing neurons in the brain due to a defective gene. While there is no cure, treatments aim to support patients through diet, exercise, and psychosocial support.