<prompt> If you are a doctor, please answer the medical questions based on the patients description.what does it mean when my chest feels tight when i take a deep breathe i have only had it for about 2 days but its a different feeling i have never had this before even when i yawn or hickup it hurts a little i dont know if its my lungs or heart what could this be?? and is this serious? thank you  <response>: Respected user, thanks for using Chat Doctor.come have evaluated your query thoroughly. There are various reasons as - Conditions of lungs infection, pneumonia, effusion, allergy, others - Problems of chest wall muscle stretch, sprain, blunt trauma, cost Chen Chat Doctor. DO NOT NEGLECT it and get an appointment with your PCP. Hope this will help you definitely. Welcome for further questions. Regards dear. 