This is the most complete clinical reference on obsessive-compulsive disorders. It incorporates scientific foundations and clinical studies. Discussed in detail are the behavioural therapies and psychotropic medications that are used to control symptoms. Practical advice is provided on clinical management. The first edition received positive reviews in the New England Journal of Medicine as 'extremely useful as a reference source for any clinician interested in treating obsessive-compulsive disorders'.The third edition is divided into six sections: Section I, The Clinical Picture - presents a descriptive picture of the clinical features of OCD; Section II, Illnesses Related to OCD: Spectrum Disorders; Section III, Pathophysiology and Assessment; Section IV, Treatment - includes detailed information on treatments that have proven effective, including behaviour therapy, medications, and the often overlooked area of neurosurgical treatment, as well as specific clinical strategies and case studies; Section V: Patient and Clinic Management - includes step-by-step information on running an OCD clinic; and Section VI, Appendix - includes rating scales, referral sources, references, etc. It includes a complete coverage of the aetiology, diagnosis, and treatment of OCD in children, adolescents, and adults written by contributors who are the leading authorities on OCD. The editors are from MGH OCD clinic, a major U.S. treatment center also involved in the latest research in OCD.