Dr. Sagar Ramesh Makode
MBBS., MD, GENERAL MEDICINE ., DM, CARDIOLOGY(SENIOR RESIDENT
Cardiology, General Medicine, Internal Medicine
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Historically, and also on investigations like TMT (treadmill test), it does not appear to be a cardiac pain (attachment removed to protect patient identity). I guess you do not smoke or drink. The usual cause for this is musculoskeletal pain arising from muscles and bones which may increase during exercise due to rapid and heavy breathing. You may be able to regenerate pain by pressing over the area.
Also, another possibility is of gastroesophageal reflux, especially if you are also having bloating, burping, nausea, epigastric pain, chest burning, sour water feeling in your throat. Your chest X-ray and lipid profile are also fine.
For more information consult a cardiologist online --> https://www.icliniq.com/ask-a-doctor-online/cardiologist