Obsessive-compulsive disorder (OCD) is an anxiety disorder. The person suffers from unwanted repetitive thoughts and behaviors.

The cause is of OCD is unknown. OCD may be due to neurobiological, environmental, genetic, and psychological factors. An imbalance of a brain chemical called serotonin may play a major role.

Genetic Material
Chromosome_DNA
The genes that you inherit from your family may play a role in the development of OCD.
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