Introduction:Headache is a symptom which may be asso ciated with a variety of clinical conditions whether the under lying disorder be organic, psychologic or psychophysiologic. Headache disorders can be classified as primary , secondary and specific types of headache.Patients usually present with primary headache in primary health care settings . More than one type of primary headache may be present in one patient and each headache has to be treated separately. Migraine is the most common severe primary headache disorder.

No abstract

Patient Controlled Analgesia is system used in postoperative pain