### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
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!

### output:

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 didn't 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 it's a pneumothorax(air getting collected around your lungs) it needs to be 