OCD can be distressing and significantly interfere with your life,The illness affects as many as 12 in every 1000 people (1.2% of the population) from young children to adults, regardless of gender or social or cultural background. It has traditionally been considered that there are four main categories of OCD. Although there are numerous forms of the illness within each category, typically a person's OCD will fall into one of the four main categories:CheckingContamination / Mental ContaminationHoardingRuminations / Intrusive ThoughtsFor many people with OCD there is often an overinflated sense of responsibility to prevent harm and an over-estimation about the perceived threat that an intrusive thought signifies.