Objectives : This study was investigated to find out psychological characteristics of headache patients after traffic accident(TA). also It was identified headache after TA as predictor of posttraumatic stress disorder(PTSD). Methods : Minnesota Multiphasic Personality Inventory(MMPI) was administered to 26 TA patients, We divided them into four groups according to headache and sex and headache duration. Results : 3-1 profile was found by total mean of T score of each MMPI scale in all patients. 3-4 profile was found in headache group, 1-3 profile was found in female Group, female to have headache group. 3-1 profile was found in headache to continue more than 7 days. Conclusions : Female group, female to have a headache group, headache to continue more 7 days group showed 1-3/3-1 profile. it was similar to PTSD profile. The results indicate that in the above three groups, headache was predictor of PTSD and they must be treated more carefully.