Chest: As a 48 year old male, you should see an MD to discuss and have an exam, you are at the prime age for heart disease and do not want to misinterpret your symptoms as a muscle spasm. If you actually see a muscle like your pec muscle twitching, then that is not your heart and yes, it is a muscle twitching which could be from overuse or an electrolyte abnormality most commonly.
Answered 4/9/2020
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