A few possibilities: Hi Sorry to hear that you are having discomfort. Bottom of the pectoral muscles where exactly? If it is in the middle, just at the bottom of the rib cage, it could be acid reflux or heart burn, which has numerous causes, including stress. If it's chest pain/rib pain, then different story. Hope you feel better soon.
Answered 5/28/2017
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A doctor has provided 1 answer
4 doctors weighed in across 2 answers
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