Costochondritis: Sharp pain in the sternal area (breastbone) during activity or after activity is almost always costochondritis (inflammation around bone-cartilage interface) and it is often difficult to treat going away by itself after several days to weeks. At 22 years old, the risk of this being coronary heart disease is very very low. Most would recommend a doctor visit to fully check out the heart.
Answered 12/19/2016
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