I have coughing problem since 3-4 yrs, which gets allevated only during winters, in summers I suffer from no as such problem. I feel like my bronchi are contracted and there is difficult In breathing, I get continuous cough for 2 -3 hrs which eventually subside then. I have done my test for asthma also but all reports are negetive. I m unable to figure out what the issue is, also I don't do any kind of exercise, yoga and stuff. Pls help on this.