<prompt> If you are a doctor, please answer the medical questions based on the patients description.tonight i had chest pains in my upper left chest, my chest felt heavy and it was hard to breathe. I have bad allergies and used to have asthma as a baby. I am 18 years old, 125 lbs, and used to be very active but not so much anymore. My question is, what is it? and are there any stretches things to do or eat to help this.  <response>: Hi, Welcome to Chat Doctor. There could be many causes for this. It could be a sequel of your childhood asthma. The childhood asthma may not be asthma but bronchitis or other lung infection. You need a detailed examination by a chest physician, as well as chest x-ray, blood tests etc. to find out the cause of this problem. You may even need an ECG to exclude cardiac problems. You should not ignore these symptoms and must consult a good chest physician immediately. Wish you speedy recovery. 