Obsessive-Compulsive Disorder, or OCD, is a condition that some people have. It makes them feel like they have to do certain things over and over again. They might feel very worried if they don’t do these things. For example, they might need to wash their hands many times or check if a door is locked again and again. It can make them feel scared or upset if they can’t do these things. People with OCD might need help from a doctor to feel better.