Many possibilities: Type of exercise? Underwire irritation? Breast issue? Musculoskeletal? You should see a doctor to be safe. Meanwhile, make sure your bra fits/ supports well and take it easy for a few days.
Answered 5/10/2014
5.6k views
Muscle sprain common: Rib dysfunction, too small bra, could contribute also. Deep breathing may help alleviate, heat pack early on also.
Answered 4/23/2016
5.6k views
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