I am experiencing moderate chest pain or discomfort of sudden onset, on the left side, that gets worse with deep breaths, sudden movements, pressing on the chest, exercise, bending forward, and that gets better with bending forward, and with a sensation o

Time to see a doctor: Moderate chest pain means she should talk with her doctor or go to the ER. She should not drive (safer by ambulance). In teen-aged adults, chest pain would very rarely be a heart attack. It more likely is something such as myocarditis, pericarditis, other heart symptoms, costochondritis (inflamed rib cartilage), pleurisy, or anxiety attack symptoms. The ER may check some tests and a chest x-ray.