Obsessive compulsive disorder

Obsessions
People with OCD have unwanted obsessions that usually come in the form of repeated, uncontrollable thoughts. However, obsessions can also come in the form of repeated images, impulses, worries, fears, doubts, or a mix of all of these. They are always annoying, unwelcome, and disturbing, and because they are so hard to ignore, they make it very hard for the person to go about their daily life. With OCD, it's important to remember that the obsessive thoughts are repeated and not done on purpose, which makes the person feel even worse. No matter what the thoughts are about, they usually make people feel uncomfortable, or "uneasy." Some people say it makes their anxiety worse or brings it on, but for others, it's just a general feeling of unease, tension, or discomfort.
Compulsion
When someone has obsessive-compulsive disorder, their natural reaction is to try to get rid of their unwanted and anxiety-causing intrusive thoughts by doing things on purpose. These are called compulsions, and they include both mental and physical actions, seeking reassurance, and avoiding people, places, and things. A compulsion can either be overt (i.e., observable by others), such as checking that a door is locked or covert (an unobservant mental act), such as repeating a specific phrase in the mind.

Types Of OCD
Regardless of the fact that there are an unlimited number of types of OCD, it has been widely believed that a person's OCD will fit into one of these five basic groups, with themes frequently spanning between categories as well.

1.Contamination Verification / Mental Contamination
2.symmetry and regularity
3.Rationalizations / Intrusive Ideas
4.Hoarding
5.Checking

What Causes OCD
Scientists have tried many theories and done a lot of research, but they haven't been able to find a clear reason why some people get obsessive-compulsive disorder (OCD). There have been many explanations of why people develop OCD. Some have argued that it is inherited, whilst others have said that life events can cause it. Others have suggested that it’s caused by a chemical imbalance in the brain.
Also, there are plenty of theories surrounding the potential causes of OCD, involving one of or a combination of either; neurobiological, genetic, learned behaviours, pregnancy, environmental factors or specific events that trigger the disorder in a specific individual at a particular point in time.

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