<s>[INST] hi i am having problems in breathing for the last 4 months. it could be anytime like when i work on computer or watch telly or sleep it could be worse when i go upstairs or walk. doctors have checked me and they have not find any problem. if there is no problem why i suffered this condition. like i feel 10 b0r 15 minutes then have a relief for 2 minutes and then starts again. [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Breathing difficulty on exertion is mostly seen with heart and lung diseases. So get done ECG, 2d echo and PFT (Pulmonary Function Test). If all these are normal then no need to worry about heart or lung related diseases. Sometimes stress and anxiety can also cause similar symptoms. So avoid stress and tension, be relaxed and calm. Don't worry, you will be alright with all these. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>