PubMed · 10210258
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1999. Current articles.. https://doi.org/10.1017/s0012162299000468
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Primary headache, such as migraine and tension type headache is a common symptom in patients presenting in emergency departments. Suspicious of secondary headache is a medical history of new onset, changing character of a previously known headache, resistancy to medication or symptoms which are not typical of primary headache.