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Obsessive-compulsive disorder is a mental disorder with two components: obsessions, which consist of thoughts, impulses, or mental images; and compulsions, which are repetitive behaviors that the person feels driven to perform in response to the obsessions.t has been estimated that about 34% of patients diagnosed with OCD are depressed at the time of diagnosis, and that 65% will develop depression at some point in their lives. Colored positron emission tomography scans (PET scans) of a human brain, showing active areas in obsessive-compulsive disorder.
Common obsessions include: 1  Fear of dirt or contamination by germs. 2  Fear of causing harm to another. 3  Fear of making a mistake.  Fear of being embarrassed or behaving in a socially unacceptable 1  manner. Fear of thinking evil or sinful thoughts.  Need for order, symmetry, or 1  exactness. Excessive doubt and the need for constant reassurance.