الفهرس 
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Abstract
There is high prevalence of this disorder in the general population throughout the world. The most prevalent headache disorders are migraine and tension-type headache.
Occupational factors may play a vital role in the pathogenesis of headache. Medical staffs confront heavy workloads and experience states of high tension and high intensity for long periods. Therefore, more attention should be paid to the health status of medical staff. Primary headache disorders are important causes of disability and reduced quality of life, and hospital workers are at high risk.
Headache is one of the most frequent diagnoses in neurology outpatient clinics. Most headaches occur in the morning and affect nearly all aspects of life. Family, friendships, daily living activities, exercise, diet, sleep, and work productivity are all affected by headaches. According to the International Classification of Headache, tension-type headache is the most common cause of headache in the general population and is most probably considered a disabling disease that often needs medical consultation; its diagnosis depends mainly upon good medical history and clinical examination.
Worldwide, it has been estimated that the prevalence of headache disorder among adults is about 50%. Markedly, 50% to 75% of 18–65 years adults have experienced headache in the last year. Most patients do not consult doctors, nor do they get medications. Less than 15% of patients consult neurologists.