What medical problem does Adrian Monk suffer from on the TV show "Monk"?

What medical problem does Adrian Monk suffer from on the TV show “Monk”? He has obsessive-compulsive disorder, or OCD. The condition is a defining part of the fictional detective’s character and affects both his daily life and police work.

Adrian Monk, played by Tony Shalhoub, is a former San Francisco Police Department homicide detective who becomes a private consultant. He is intensely distressed by contamination, disorder, germs, and asymmetry, and often performs repetitive actions or rituals to reduce that distress. The series also gives him numerous phobias.

The show explains that the murder of Monk’s wife, Trudy, worsened his existing OCD and contributed to depression and agoraphobia. Therapy becomes a recurring part of the story, particularly with psychiatrists Dr. Charles Kroger and Dr. Neven Bell.

OCD is not simply a preference for tidiness. In clinical terms, it involves intrusive, unwanted obsessions and repetitive compulsions. “Monk” exaggerates some symptoms for comedy and drama, so the character should not be treated as a complete picture of the real disorder.