But why does it happen Here's why your nipples may be standing tall. Nipples may become hard and sore due to exercise, menstruation, allergies, eczema, paget's disease, breast cancer, and more There are several reasons nipples hurt, with causes ranging from benign (not harmful) to serious and including everything from hormonal changes to infection Depending on the cause, nipple pain can extend into the areola—the ring of pigmented skin around the nipple—and may ache, tingle, throb.
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