Explore clear, evidence-based articles about obsessive-compulsive disorder (OCD), including intrusive thoughts, compulsions, checking, reassurance seeking, rumination and the many different ways OCD can present. Written by  Dr Elaine Ryan CPsychol, these resources explain how OCD works and how treatments such as cognitive behavioural therapy (CBT) and exposure and response prevention (ERP) can help. Start with the comprehensive guide to OCD or browse the articles below for practical information and strategies.