Obsessive–compulsive disorder (OCD) is a mental disorder in which a person feels the need to perform certain routines repeatedly (called "compulsions"), or has certain thoughts repeatedly (called "obsessions"). The person is unable to control either the thoughts or activities for more than a short period of time.

Obsessive-Compulsive Disorder (OCD) is a common, chronic, and long-lasting disorder in which a person has uncontrollable, reoccurring thoughts (obsessions) and/or behaviors (compulsions) that he or she feels the urge to repeat over and over.It is believed that OCD likely is the result of a combination of neurobiological, genetic, behavioral, cognitive, and environmental factors that trigger the disorder in a specific individual at a particular point in time. ... People with severe OCD symptoms may have a second variation in the same gene.At home, OCD symptoms might look like: Withdrawing from family and friends because of obsessions with contamination. Avoiding physical intimacy with a partner out of fear of germs, religious impurity, or intrusive violent thoughts.

Each dimension includes obsessions and compulsions.

Four Types of OCD. Contamination & Washing. ... Doubt About Accidental Harm & Checking. ... Just Right OCD: Symmetry, Arranging, & Counting. ... Unacceptable Taboo Thoughts & Mental Rituals.