I have constant pain above my left breast and in my left arm. I exercise a lot and stress a lot. I don't take any chronic medication. Should I worry?

Chest and arm pain. I understand your concern. ‘Exercising a lot” may cause straining or tearing of the muscle fibers of pectoral muscles leading to pain above left breast. “Stressing a lot” about appearance, self-image, and relationships can cause anxiety with pain above left breast and left arm. Be concerned about “Having constant pain” and see Physician for Diagnosis and treatment. See Psychiatrist for stress.