Huntington’s disease is a rare genetic condition which damages the nerve cells in the brain. This can affect a person’s movements, thinking, memory, and mental health. Usually, it is inherited from a parent through a changed gene. Symptoms often appear in a person’s 30s or 40s. If symptoms start before age 20, the condition is called juvenile Huntington’s disease which may progress faster and look different. While there’s no direct cure for this disease, medicines can help manage symptoms like extreme mood changes and jerking movements. However, this does not stop the disease from getting worse over time.