Obsessive-compulsive disorder
If you suffer from compulsive thoughts and/or perform compulsive actions, you have obsessive-compulsive disorder. Because thoughts are compulsive, it is called an obsession and when actions are compulsive as well, it is called compulsive. The fact that you suffer from this is very annoying. Someone who is not familiar with it will find it strange, because such a compulsive disorder is difficult to counteract and to stop thinking and acting compulsively.

What are the symptoms of obsessive compulsive disorder?
The symptoms can be found in both the compulsive thoughts and the compulsive behaviour. Compulsive thoughts are recurring thoughts and they are persistent. Even if you do not want to and try to think of something else, the compulsive thoughts keep recurring. They are usually not useful thoughts either, so that you have something to think about; they are actually thoughts that sometimes frighten you. Think of scary diseases you might catch, making terrible mistakes, being polluted or obsessive thoughts about religion or sex.