Scientists have shown that obsessive compulsive disorder is linked to differences in brain structure in a breakthrough that could lead to new treatments for the condition. OCD, in which obsessive thoughts drive sufferers to carry out bizarre and repetitive rituals, affects up to 3 per cent of the population. Symptoms may include repeated hand-washing, the constant need to check doors are locked and the arranging of items in a specific order. picked by AutumnLotus 11 months ago