Today we had a training session after school on understanding Obsessive Compulsive Disorder. Did you know that it affects 1-3% of the population? It is equally common across genders and ethnicities and onset is around 11 years although it has been seen as young as 6 years old. Although there is no definite cause, brain chemicals, genes and environmental factors such as stress can all play an important part. This was just some of the information that we were given in our talk from Benny who works with South London and Maudsley.