<s>[INST] hi i have problems breathing on and off i got my lungs checked twice i use to take lot of pills supplement that is could it be over the years it has affected me my doctor says no i believe it might be my respiratory system? maybe my thyroid thank you for your time [/INST] Thanks for your question on Chat Doctor. I can understand your situation and problem. In my opinion you should consult pulmonologist and get done1. Chest x ray2. PUT (pulmonary function test). Many times clinical examination of respiratory system is normal but chest x-ray and PFT are abnormal and indicative of disease. Chest infection can cause breathing problem. So chest x-ray is needed. Bronchitis can cause breathing problem, so PFT is needed to rule out it. If both are normal then you may have anxiety and related symptoms. So better to avoid stress and tension. Be relax and calm.Don't worry, you will be alright. </s>