I am experiencing chest pain or discomfort (better by: nsaids (ibuprofen, naproxen, etc.)) (quality: stinging or burning sensation) (time frame: gradual) (side: left) (severity: mild) (worsened by: after deep breaths) . the following also describe me: sh

Costochondritis.: This sounds like costochondritis, an inflammation of one or more of the joints that connect the ribs to the sternum. However, I think your question cut off so I may not be seeing it in totality. If you’re having any shortness of breath, exertional chest discomfort, palpitations or sweats then you should at least have a chest X-ray and ECG if not stress test, just to be on the safe side.

Rib cage: This symptom doesn't fit cardiac or lung causes, but is consistent with rib cage origin such as Inflammation of chest wall muscles or costochondral joints(juncture of ribs and sternum). Pinched intercostal nerves which run between 2 ribs cause Sharp, fleeting pain. Look for tender areas. Avoid exercises stressing chest wall. See your physician if symptoms persist. Xrays may be ordered.