What is OCD and can TMS help? OCD, Obsessive Compulsive Disorder, is generally a two-part mental disorder involving intrusive thoughts and compulsions. OCD begins with intrusive thoughts. Intrusive thoughts are the “obsession” part of OCD, and can lead one to feel fear, disgust, anxiety, guilt or other distressing emotions. In order to relieve oneself from … What is OCD and can TMS help?