<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi,Basically I was on a plane earlier this week travelling home, when I got a funny feeling in my chest. At first i thought it was a heart attack, but as I didnt collapse or get any ther symptoms, I presummed not. The problem has persisted, and it feels like a shortness of breath and tightness in my chest. I read up on the problem, and it says it could be a collapsed lung, or Primary spontaneous pneumothorax. I read the cause, and it says it is common in males, young, smokers and can start from a change in atmospheric pressure. I am 21, male, a smoker sorry, I know, trying to give up, and the plane would explain this. I was wondering if you could give me some advice, as I dont really have lots of free time to visit a doctors, as I have a disserttation in in 2 weeks. Thanks!  <response>: Hello ! Yes pneumothorax is definitely one of the possibilities. However, it is not the only possibility. Since you mentioned shortness of breath and chest tightness, even bronchial asthma is a possibility. Have your ever had similar episodes in the past ? Problems related to your heart cannot be ruled out just because you didnt collapse. The oxygen levels Chat Doctor. You need to be examined by a physician in person. You will need a Chest X-ray, ECG, Spirometry pre- and post-bronchodilator for basic cardiorespiratory evaluation. Treatment needs to be decided based on your final diagnosis. Do not miss consulting because if its a pneumothoraxair getting collected around your lungs it needs to be 