this follow-up study 1 to 5 years after biofeedback therapy , involving 58 patients in six diagnostic groups ( migraine headache , tension headache , mixed headache , chronic pain , anxiety , and essential hypertension ) , revealed that 86 % of the patients who continued to practice relaxation techniques improved , while only 50 % of those who had stopped practice improved ( p = .04 ) .
C0033893
tension headache
C0018681
headache