A migraine headache is a specific type of headache which is thought to be of vascular or neurologic origin. They are more common in women and in some patients can occur regularly, often following a particular part of the menstrual cycle. While they traditionally are described as causing pain on only one side of the head, they can occasionally cause pain on both sides of the head as well. In addition to the headache, other neurological symptoms usually accompany the headache.
For example, many patients describe having an “aura” prior to the onset of the headache. These can vary but the patient generally has some symptom that lets them know a headache is coming. They can even experience seemingly focal neurological symptoms such as a scatoma (a temporary blind spot in their field of vision) or other visual changes. Photophobia, avoiding bright lights, can occur as well. Finally, many patients experience nausea and even vomiting. All of these neurological effects do not occur in a typical tension headache and help to distinguish migraines. However, some of the symptoms of migraine, particularly the nausea and vomiting and photophobia, are similar to symptoms of more serious causes of headache such as subarachnoid hemorrhage or meningitis. Therefore, those more serious disorders should be ruled out before classifying a headache as a migraine.
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