Obsessive-Compulsive Disorder (OCD) is a disorder in which individuals have recurring, unwanted thoughts, or ideas known as obsessions, that make them feel driven to engage in repetitive behaviors known as compulsions. OCD obsessions can include: fear of contamination, extreme concern with order and precision, and recurrent intrusive thoughts of sounds, images, words, or numbers. OCD compulsions can include: excessive hand washing or other hygiene practices, repeated cleaning, arranging items in a specific way, repeatedly checking locks or appliances, constantly seeking approval or reassurance, and repeated counting.