Unfortunately, breast pain or discomfort is common in adolescent girls. It usually happens in cycles and occurs just before she menstruates. Research has shown that this pain can be increased if a girl drinks anything with caffeine in it, whether it’s coffee, soda, or an energy drink. (And, as a further incentive not to use cigarettes, you should let your daughter know that smoking also tends to increase breast pain.)
A breast surgeon I know tells his patients who experience breast pain to avoid caffeinated products, chocolate, and peanuts; to use over-the-counter medications such as acetaminophen and ibuprofen as needed; and to wear only well-fitted, supportive bras. That’s good advice for all of us women. (Except for the “no chocolate”part, of course.)