Causes: OCD sometimes occurs for no reason, but it may be triggered by stressful life events. It can be caused by a lack of serotonin in the brain. It also tends to run in families, suggesting that some people have a genetic predisposition to OCD. 

Effect: People with OCD are tormented by unwanted thoughts and feel compelled to carry out rituals to free themselves of these thoughts. For example, you may be very worried that there are germs on your hands, and to make yourself feel better you wash them. Washing relieves your anxiety for a while, so it becomes a ritual. This creates a vicious cycle and you might wash your hands twenty or more times an hour, even when your skin is raw from scrubbing. Other OCD behaviours include counting objects, checking switches are turned off and doors are locked, or rearranging furniture so it is symmetrical. If a person cannot carry out their rituals, they feel panicky and fear that a disaster will happen. 

Solutions: The first step is breaking the cycle. Remind yourself that your desire to carry out a ritual is a symptom of OCD, and will not protect you from harm. When you have resisted a compulsion a few times, it will get easier.

Cognitive Behavioural Therapy may help.

Anti-Depressants.   

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