Are you sure your not pregnant? Depends on your age. Your breasts could be beginning to grow if you are very young, or if you've gotten your period and are sexual active, you could be pregnant.
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if its not caused by trauma then it means your hormones have changed due to something a long the lines or pregnancy, or every month cycle
Following childbirth a woman's nipples will get hard and the breasts will hurt when engorged with milk. See a doctor to make sure there are not any other medical conditions causing this.