<s>[INST] hello , im am 14 years old and is having sharp chest pains on my heart about 3 times a week and they last about 15-20 seconds long but sometimes they last 1 minute , im and not over weight i weigh 103.5 pounds and is 5 2. Do you have any idea what this could be? its been going on since i was about 12 or 13 [/INST] Thanks for your question on Chat Doctor. I can understand your situation and problem. In my opinion you are mostly having anxiety and related symptoms. At your age(14) cardiac disease is extremely uncommon. But better to rule out cardiac cause first for your chest pain. So get done ECG.  If ECG is normal then no need to worry much for cardiac cause. You are having anxiety mostly. Better to consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on its solution. Avoid stress and tension. Be relax and calm. Don't worry, you will be alright. </s>