DEAR DOCTOR K: I started taking combined birth control pills a few months ago. Ever since then, I sometimes feel nauseous and get severe headaches. Should I switch to a different pill?
DEAR READER: Nausea and headaches are common side effects of birth control pills, but they usually can be eliminated by adjusting the pills. Combined birth control pills contain the hormones estrogen and progestogen. When taken correctly, they are 98 percent to 99 percent effective in preventing pregnancy. But these hormones can cause side effects.