Obsessive Compulsive Disorder (OCD) – A Primer on Neurobiology, Diagnosis and Treatment
The hallmark of obsessive-compulsive disorder (OCD) is the presence of obsessions and compulsions. It has a bimodal incidence with peaks occurring in late childhood/early adolescence and again in early adulthood (20-29).
The lifetime prevalence of OCD is believed to be between 1% and 3%, and patients can experience chronic or episodic OCD symptoms throughout their lifetime. OCD is a time-consuming and distressing mental state that has higher disability-adjusted years than Parkinson’s disease and multiple sclerosis, combined making OCD one of the top 10 most disabling medical conditions. 
OCD is believed to diminish the quality of life of the patient similar in extent to those individuals with schizophrenia. 
OCD symptoms are time-consuming and distressing and are often accompanied with strong avoidance behaviours.