Trichotillomania

Trichotillomania, a hair-pulling disorder, is a mental disorder that involves an irresistible urge to pull out hair. This behavior occurs to the point of noticeable hair loss. The most common areas for hair pulling are the scalp, eyelashes, and eyebrows but may involve hair anywhere on the body.

Trichotillomania is a type of impulse control disorder. Impulse control disorders are mental illnesses that involve the repeated failure to resist impulses, or urges, to act in ways that are dangerous or harmful. People with these disorders know that they can hurt themselves or others by acting on the impulses, but they cannot stop themselves.

In children, trichotillomania occurs equally in males and females. In adults, it is more common in women than in men.
Symptoms of Trichotillomania
A person with trichotillomania cannot control or resist the urge to pull out his or her body hair. Other symptoms that might occur with this disorder include:

    A sense of tension before pulling hair or when trying to resist the urge to pull hair
    A feeling of relief, satisfaction, and/or pleasure after acting on the impulse to pull hair
    Presence of bare patches where the hair has been pulled out
    Presence of other associated behaviors such as inspecting the hair root, twirling the hair, pulling the hair between the teeth, chewing on the hair, or eating hair (called trichophagia)

Many people who have trichotillomania try to deny they have a problem and may attempt to hide their hair loss by wearing hats, scarves, and false eyelashes and eyebrows.
Causes to Trichotillomania
The exact cause of trichotillomania is not yet known, but it appears to involve both biological and behavioral factors. Research has found a potential link between impulse control disorders, such as trichotillomania, and certain brain chemicals called neurotransmitters. Neurotransmitters help nerve cells in the brain send messages to each other. An imbalance of these chemicals can affect how the brain controls impulses. It also is believed that stress can trigger the impulsive behavior, and that some people continue the behavior out of habit.

In some cases, people with trichotillomania also have other disorders such as depression or anxiety. This suggests that there might be a link between these disorders and the development of trichotillomania. In addition, the risk of developing trichotillomania is slightly higher in people who have relatives with the disorder, suggesting that a tendency for the disorder may be inherited.