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========== In ancient Greece, headaches were
considered powerful afflictions. Victims prayed for relief from Asclepius,
the god of medicine. And if pain continued, a medical practitioner would perform
the best-known remedy— drilling a small hole in the
skull to drain supposedly infected blood. This dire technique, called trepanation, often replaced the headache
with a more permanent condition. Fortunately, doctors today don’t resort
to power tools to cure headaches. But we still have a lot
to learn about this ancient ailment. Today, we’ve classified headaches
into two camps— primary headaches and secondary headaches. The former are not symptomatic of an
underlying disease, injury, or condition; they are the condition. But we’ll come back to them in a ...