OCD or Obsessive Compulsive Disorder is a mental health condition consisting of disturbing unwanted thoughts (obsessions) followed by repetitive physical or mental behaviours (compulsions). Each person that suffers from this disorder might live with different obsessions and engage in several physical or mental compulsions in an attempt to get rid of these intrusive thoughts. These 4 categories here represent examples of different themes and obsessions that people who suffer from OCD can experience. OCD is severely incapacitating and considered one of the most disabling illnesses.
If you suspect that you might have OCD, please consider seeking help from a professional.