46 y/o male.  2 episodes of passing out while laughing, also has cold/flu wheezing during these times.  went to pulmonogist who suspected asthma, while taking the pulmonary function test trying to exhaled hard, i passed out 3rd time.  all cardiac tests came out ok.  could asthma exacerbated cause passing out \"vasal vagal syncope\"? thank you.
Thanks for your question on Chat Doctor. I can understand your situation and problem. Yes, cough and breathlessness induced vasovegal syncope can cause similar symptoms like you have. In my opinion, you are mostly having bronchitis. So better to consult pulmonologist and get done 1. Clinical examination of respiratory system. 2. PUT (Pulmonary Function Test). PFT is needed to rule out asthma or bronchitis. It will also tell you about severity of the disease. And treatment is based on severity only. So better to get done PFT. You may need inhaled bronchodilators and antihistamines Chat Doctor.  So consult pulmonologist and first diagnose yourself and then start appropriate treatment. Don't worry, you will be alright.