Can u tell me what cause so much of pain in back have copd 3 spot on lung cought all time hurt to breaher in deep ?

Many possibilities: Age not given nor if you do or don't smoke or if you did in the past. Cough can be related to a constant irritation of your lung tubes or an irritating process in your lung breathing tissue.The cough could be related to the "spots" in your lung. Hard and/or frequent cough can hurt the back and strain chest wall muscles. You need to see your Dr. soon for full evaluation. Spot cause must be IDed.