Each person who suffers from Obsessive Compulsive Disorder (OCD) describes slightly different problems. In general people with OCD experience obsessions. These are thoughts, pictures of impulses which are usually unpleasant and come into mind when we don’t want them.
Many things can trigger these obsessions, and they usually leave the person feeling very anxious, uncomfortable, or frightened. The compulsion is the behaviour performed in order to put right the obsession. Sometimes the behaviour performed is quite irrational (and the OCD sufferer recognises this) such as counting up in sevens for seven minutes.
Many people experience obsessions and compulsions and are able to live with this without problems. People may think about seeking help when their lives are becoming disrupted by these unwanted thoughts and actions.