Obsessions: thoughts, impulses or images that become intrusive,  inappropriate, and cause anxiety or distress. These thoughts, impulses or  images are not simply excessive worries about real-life problems.

Compulsions: repetitive behavior (e.g., hand washing, checking, arranging,  etc.) or mental acts (e.g., praying, counting, repeating silent words) that the person feels driven to perform and that cause anxiety or distress if not done.