Obsessive/Compulsive Disorder was at one time thought to be a rare problem. However, like many anxiety states, people who suffer from Obsessive/Compulsive Disorder (O.C.D.) keep their problems much to themselves.
It is because of the very irrational nature of many obsessions that many sufferers are frightened and embarrassed about revealing their problems.
Thus, until the last few years, the true incidence of the problem was unknown, there are varying estimates of the numbers of people suffering from O.C.D.Read more on nopanic.org.uk