<s>[INST] well i dont konw if it has to do with bronchtis but tonight while sleeping i woke up to an intense pain right underneath my left breast. it is like an intense pain right underneath. it hurts more when i take deep breaths. i was wondereing if it could be from being sick cuz i do have the flu so whats going on?? im so scared!! [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Yes, bronchitis can cause chest pain. Bronchitis can cause pleurisy (inflammation of pleura) and this can cause chest pain on breathing. But in my opinion, we should rule out heart diseases because you are having midnight left sided severe chest pain which is more common in heart diseases. So first get done ECG and 2d echo. If both these are normal then no need to worry about heart diseases. Take simple painkiller and anti-inflammatory Chat Doctor.  Apply warm water pad on affected areas. This will also give symptomatic relief.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>