my dad (51) has had an awfull cough for about 3 month now, its awfull andsounds really dry, and is getting worse, he reffuses to go to the doctor because he doesnt want to waste there time, but me and y mum are pretty worried and want him to go for a chest scan, my dad has never smoked and doesnt drink heavily atall, from a medical point of view, could this be serious, and what should i do

thankyou for your help xx