First of all visit this amazing website: www.trichotillomania.co.uk
The American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) defines trichotillomania as:
Recurrent pulling out of one’s hair resulting in noticeable hair loss.
An increasing sense of tension immediately before pulling out the hair or when attempting to resist the behavior.
Pleasure, gratification, or relief when pulling out the hair.
The disturbance is not better accounted for by another mental disorder and is not due to a general medical condition (e.g., a dermatological condition).
The disturbance causes clinically significant distress or impairment in social, occupational, or other important areas of functioning.
Not every person who pulls out their hair meets these strict criteria. Nonetheless, they frequently have a distressing problem that might very well benefit from treatment.