I have a slight constant pain in my left side chest. Sometimes my heart beat speeds up. What can cause this.

Not enough info to . Diagnose properly online. Heart rate is supposed to be variable. Slight constant left chest pain could be muscular, pulmonary, cardiac and should be checked out if you are concerned.

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Near constant dull achy feeling in left side of chest. HR 25 beats higher than usual when exercising. Visible heart beat/palps. Clear ekg and blood. 17?

Chest pain. Left sided chest pain and increased heart rate. If evaluation was normal likely some type of pleurisy. Try course of ibuprofen. If persistent especially with palpitations could be some type of valvular problem. Read more...
What did the Dr say? You must have seen a Dr for EKG and blood tests: what did the Dr say? Are you 17 ???? This symptom is sometimes frustrating and difficult to evaluate. You may need to see 1 or more specialists before you are done. Read more...