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Ask Dr.lisa

Q: I'm on antibiotics and heard they can double my risk for breast cancer. Should I worry?

A: Probably not. A study that appeared in the Journal of the American Medical Association did link long-term antibiotic use to increased breast cancer risk, but it did not conclude that the drugs actually cause cancer. Researchers found a doubled risk only in women who'd received more than 25 antibiotic prescriptions or had taken the medication for more than 500 days. Experts stress that other factors, such as a weak immune system, may play a bigger part in upping the odds. Ask your doctor about alternative treatments for your condition, and keep exercising—it can boost your immunity and reduce your breast cancer risk.

Lisa Callahan, M.D., is the author of The Fitness Factor (The Lyons Press). Send your personal health questions to drlisa@self.com.