Hi I am 25 year old man with weight 68kg and height 5.11 . I have cough problem from last 5 month. In a week I have cough regularly for one time for 1 and half hour. This happen only one in a week and other 6 day I am fit 100% fit. Why this happen?
You have allergic cough, so when you get exposure to allergens you got coughing.  If coughing persistent than you consult your doctor and take treatment for that.  If recurrent, then go for allergic tests and immunotherapy.