Clothing
One of the chief causes of nipple pain can be a poorly fitting bra, or one whose fabric proves irritating. If you’re wearing an older bra, check and see if there’s anything (worn, rough fabric; loose stitching) that might be rubbing on your nipple. If your bra is new, try going back to one of your old favorites, and see if the pain abates.
Chemicals
Another common cause of sudden-onset nipple pain is a change in laundry detergent or shower gel; you might be having a reaction to one of the chemicals in these products. Or perhaps you’ve been swimming in a chlorinated pool more than usual; chlorine can dry and irritate skin, and your nipples are no exception. See if changing back to your old detergent or shower soap - or reducing your hours in the pool - takes the pain away.
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