Obsessive-compulsive disorder (OCD) is an anxiety disorder. A person with OCD has 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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