The OCD Spectrum of Disorders
These are diagnostic categories seen as related to OCD and often seen as co-morbid or co-existing with OCD.

Body Dysmorphic Disorders (BDD)

This is defined as not perceiving the objective reality or a misperception of the body.  An example of this is a person seeing a body part as being ugly, defected or deformed.  This is either a gross exaggeration of the body imperfection or seeing a problem that does not exist at all.  Compulsions involved may include checking, seeking repetitive reassurance or covering the area from public view.

Trichotillomania (TTM)
A condition whereby a person compulsively searches for a particular feel of a hair, and then pulls that hair out.  This can lead to bald patches or total baldness.  The hair may be from the head, eyebrows, eyelashes or from any other part of the body.  The treatment for this is called “Habit Reversal” which involves awareness training and competing muscular responses.

Anorexia Nervosa
An eating disorder characterized by extremely low body weight, body image distortion, and an obsessive fear of gaining weight. Individuals with anorexia nervosa are known to control body weight commonly through the means of voluntary starvation.

Bulimia
Bulimia or Bulimia Nervosa is an eating disorder characterized by recurrent binge eating, followed by vomiting (purging), fasting, or the use of enemas, laxatives, or diuretics. Over-exercising is also very common with this disorder.  

Tourettes Syndrome
This disorder involves repetitive, stereotyped, involuntary movements and vocalizations called tics. Vocal tics include coprolalia (uttering swear words) or echolalia (repeating the words or phrases of others). Some of the more common physical tics include eye blinking, facial grimacing, shoulder shrugging, and head or shoulder jerking.

Nail Biting (Onychophagia) and Compulsive Skin Picking (Dermatillomania)
People who suffer from these behaviors may experience bleeding, bruises, infections, or even permanent damage to the fingers or skin. The behavior is often unconscious, and if unaware of their actions, people with this compulsion may have difficulty stopping.