Repetitive, ritualised behaviours (referred to as compulsions or compulsive behaviours) such as excessive hand-washing, endlessly checking to make sure that something has been done, an unhealthy degree of religiosity, and so forth. An attempt to resist a compulsive behaviour produces mounting tension and anxiety, which are relieved immediately by giving in and carrying out the behaviour. The term is not used for behaviours like excessive drinking, gambling, and eating etc. because these behaviours can cause considerable pleasure from. A person experiencing true Obsessive Compulsive Disorder (OCD) derives no pleasure from it other than the release of tension.
 

The problem lies in the fact that while these repetitive behaviours or compulsions might keep the unwanted anxiety at bay, they can become a hindrance to living positively in their own right, while also doing nothing to tackle the root problem. People with OCD often have a very negative self-image, and worry that if they do not engage in their obsessive behaviours, they might act out on their unwelcome thoughts and impulses.
 

OCD is often associated with a range of other disorders too, such as social anxiety, Asperger’s, ADHD and more. Sufferers can also be tempted to “self-medicate” with alcohol and illegal or prescription drugs.