Causes of Obsessive compulsive disorder

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The exact cause of OCD is unknown.

OCD may involve abnormal functioning of the neurotransmitter seratonin in the brain. It is believed that insufficient levels of serotonin are involved in OCD. Drugs that increase and sustain the serotonin levels in the brain often help improve OCD symptoms.
Stress does not cause OCD; however, a stressful event seems in some cases to trigger the onset of the condition.
OCD tends to run in families. Research suggests multiple genes are involved.
The type of personality may also be important - perfectionists seem to be more prone to developing OCD.