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Obsessive-compulsive disorder (OCD) is a mental illness that causes repeated unwanted thoughts or sensations (obsessions) or the urge to do something over and over again (compulsions). Some people can have both obsessions and compulsions. OCD isn’t about habits like biting your nails or thinking negative thoughts. An obsessive thought might be that certain numbers or colors are “good” or “bad.” A compulsive habit might be to wash your hands seven times after touching something that could be dirty.

Known characters with OCD

Adrian Monk

Harold Krenshaw

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