Ok so I've had a cough for 3 months now been to doctors loads.. sent off for an xray all clear. Asthma test all clear, they listen to my chest said it sounds normal. Was given a nasal spray it helps a little but doesn't go. I now have bad back paid but it is that time off month!. When I Google it brings up lung cancer!. I'm 26 never smoked, I suffer from hay fever doctor said I could be my sinuses made worse by hayfever as I constantly have a runny nose but I cnt blow out does anyone know what it could be?. My cough is worse in morning and I sometimes feel like I need to clear ma throat it's a tickly cough!.