The habit of pulling out the hair, often associated with mental illness or psychotic illness (such as SCHIZOPHRENIA). Hair-pulling may also take place among disturbed children who are anxious and frustrated. Typically, the patient will pull, twist, or break off chunks of hair, leaving bald spots; children sometimes eat the removed hair, which may cause a hairball in the stomach. Adults may sometimes pull out their pubic hair. The condition is treated with psychotherapy and/or antipsychotic drugs.