A person with obsessive-compulsive disorder (or OCD) may experience:
Concern about contamination or serious illness
Too much concern with keeping everything arranged in an exact way
Intrusive thoughts or horrible mental images
Sexual or religious thoughts felt to be unacceptable
Excessive fear of your house burning or flooding, of causing a car wreck, of spreading an illness, of losing something, of being responsible for another person getting hurt
Fear of harming another person...