History of head trauma with loss of consciousness preceding symptom onset by a maximum of 4 wk. Symptoms in 3 or more of the following symptom categories: headache, dizziness, malaise, fatigue, noise intolerance; irritability, depression, anxiety, emotional lability; subjective concentration, memory, or intellectual difficulties without neuropsychological evidence of marked impairment; insomnia; reduced alcohol tolerance; and preoccupation with above symptoms and fear of brain damage with hypochondriacal concern and adoption of sick role.