Chest pain is one of the most common reason people visit the emergency room. most often these pains can be attributed to mundane or harmless causes, but the list of harmful or even lethal causes is too high to ignore. example 1: 3 weeks of interminent sharp pain, worse on movement or strong cough, and night sweats might be a pneumonia. example 2. sudden onset of sharp chest pain worse in certain positions, fast heart rate, and maybe low o2 saturation might be a pulmonary embolis...or more accurately a pulmonary infarct. example 3: a female, a diabetic, high blood pressure or combination of those might exhibit no pain, atypical pain or practically any description and be having a heart attack. If the pain continues get checked out, this list of possible causes is huge.