An obsession is basically the same thing as a compulsion.

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While an obsession and a compulsion are both features of obsessive-compulsive disorder (OCD), they are not the same thing. An obsession is a persistent and intrusive thought, urge, or image that causes significant distress or anxiety. A compulsion is a repetitive behavior or mental act that a person performs in response to an obsession, typically to reduce the anxiety caused by the obsession.

An Obsession Is Basically the Same Thing as a Compulsion