Abstract
To the Editor.— Migraine was not discussed as a cause of severe headache and nausea of several days' duration in the Question and Answer entitled Return to Low-Altitude Sickness.1 Any recurrent headache with nausea is a migraine until proved otherwise. Only about 50% of migraine is unilateral. The neurotransmitter mechanism in the reticular substance that is the cause of migraine may be triggered by changes in barometric pressure, substances contained in certain foods such as a gringo menu of frijoles seasoned with monosodium glutamate and sharp cheese, wine, exposure to glare off an airplane wing, positive or negative emotion on returning to one's family, hormonal changes of the approach of the new menstrual month, or other factors unique to the individual. A double dose of two or more of these factors, for example, sitting on the sunward side of the plane going home as opposed to the shady side on
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