<s>[INST] this doesnt happen all the time but i will get a sudden pain in my chest that feels like someone punches me right in the heart. it takes my breath away for a second and i feel weird for about 5 minutes kinda like im a little weak. what could this be? thanks [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Sudden onset left sided chest pain should always be evaluated for heart diseases. So first get done ECG, 2d echo and stress test (trade mill test). If all these are normal then no need to worry about heart diseases. Sometimes undiagnosed stress and anxiety can also cause similar kind of chest pain. So avoid stress and tension, be relaxed and calm.Don't worry, you will be alright but first rule out heart diseases. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>