Probably a muscle: strain, but pain in your upper back/chest is a bit of an unusual location. Also, pain with inhalation is of concern. I don't have your age, or whether or not you are a smoker or might have asthma. I would get this checked out, mostly because of the VERY unlikely possibility this is pulmonary embolism, or blood clot to the lung. Go to ER/Urgent Care or your doctor's office today! Best wishes!
Answered 1/14/2015
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