The cause of obsessive-compulsive disorder isn't fully understood. Main theories include:

  • Biology. OCD may be a result of changes in your body's own natural chemistry or brain functions. OCD may also have a genetic component, but specific genes have yet to be identified.
  • Environment. Some environmental factors such as infections are suggested as a trigger for OCD, but more research is needed to be sure.
Aug. 09, 2013

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