My nipples hurt when I touch them, it's like there's a lump in it. It really hurts when squashed. Anyone know what causes them? - Quora

Answer (1 of 3): Friction is the most common reason for the nipples to be sore. Friction can occur if the nipples rub against a shirt or poorly-fitting bra, during sports activities, such as running, surfing, or basketball. Friction on the nipple can often cause soreness and a stinging pain. The

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