<s>[INST] i have severe pain under my left breast above rib cage pain goes to the back. i had a ct scan today no blood clots in lungs exray but dont know what it showed. ekg shows abnormalties deep breathes hurt and make me cough short of breath and light headed [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Left sided chest pain should always be evaluated for heart diseases first. You are also having abnormal ECG, so possibility of heart disease is more. So consult cardiologist and get done blood pressure monitoring, 2d echo, stress test (trade mill test) and coronary angiography. You may need cardiac supportive Chat Doctor.  Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>