"Having a cup of coffee at the first sign of a headache is an old trick, because caffeine has a mild [painkilling] effect and can be very useful in the early stages," says Dr. Loder. "But it's important to not overdo it, because you can build up a tolerance for it." Caffeine is a double-edge sword, she explains: If you consume too much, too regularly, you will experience withdrawal on the days you don't get it. "Keep your regular intake fairly low so that when you need it intermittently you can pull it out as a secret weapon," she says. "If you're regularly drinking six or seven cups a day, you're kidding yourself if you think an extra one is going to do you any good."
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