Causes of deep burning sensation in right side of chest and right upper back/middle back? on and off, don't last long. don't think it's heartburn

Needs to be watched: In your age group, the most common causes are musculoskeletal problems that usually self-resolve. Esophageal spasm can cause deep middle pain. Acid reflux is also a possibility despite taking tums (calcium carbonate). Young women who are smokers and are taking oral contraceptive pills are at risk for lung blood clot that can cause chest pain. Heart issues need always to be ruled out but are unlikely at your age.