Obsessions describe intrusive thoughts or feelings that enter our minds which are disturbing or upsetting; compulsions are the behaviours we carry out in order to manage those thoughts or feelings. For example, a young person may be constantly worried that their house will burn down if they don’t turn off all switches before leaving the house. They may respond to these thoughts by repeatedly checking switches, perhaps returning home several times to do so. Obsessive compulsive disorder (OCD) can take many forms – it is not just about cleaning and checking.