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Headache: International Headache Society
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Tension headaches, which were renamed [T]ension-type headaches by the International Headache Society in 1988, are the most common type of primary headaches. The pain can radiate from the neck, back, eyes, or other muscle groups in the body. Tension-type headaches account for nearly 90% of all headaches. Approximately 3% of the population suffers from chronic-tension type headache.[1]
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Patients rated their headache pain using the International Headache Society (IHS) 4-point rating scale. The primary efficacy endpoint was headache pain relief (headache pain rated as mild or none) at 2-hours post-dose. Secondary efficacy endpoints for the trial included various additional measurements of pain relief, as well as effects on nausea, vomiting, phonophobia and photophobia. All results were considered statistically significant at the p < 0.05 level and all analyses were made on an intent-to-treat basis. Side effects were recorded throughout the clinical trial study period.
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Contemporary doctors divide headaches into two large categories, primary and secondary, according to guidelines established by the International Headache Society (IHS) in 1988 and revised for republication in 2004. Primary headaches are those that are not caused by an underlying medical condition. There are three types of primary headaches: migraine, cluster, and tension headaches. More than 90% of all headaches are primary headaches. Secondary headaches are caused by disease or medical condition; they account for fewer than 10% of all headaches.
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Daily headache may occur as a chronic tension-type headache, but is often a combination of tension-type and migraine (as often seen in headache clinics). This type of combination headache does not appear in the current IHS (International Headache Society) classification, but will be added in the revised version to be published in 2003 or 2004. Most often, this type of combination or "mixed" headache occurs in an individual who initially had typical episodic migraine but in whom develops, over several years time, a chronic daily or almost daily headache.
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There are many different types of headache, whether considered as to how they behave or as to how they are caused. Headache may broadly be classified as primary or secondary: there are situations in which headache itself is the problem (primary headache), and others in which headache is a symptom of some other condition (secondary headache). Headache has been classified in detail by the International Headache Society, and whole textbooks have been written about it.
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