I have no such underlying medical issue that has been diagnosed before. Although am not doing physical exercises since the past couple of months, I used to go to the gym regularly till the end of last year, I've never experienced breathlessness or shortness of breath and I was regularly doing both cardio and weight training. But since the last 1 month I have been frequently feeling breathless even while taking a short walk or when I speak a lot. There are no other physical difficulty. I would like to know what could be the probable cause of this and what are the remedies.