Chronic lung diseases like COPD and cystic fibrosis can also cause a productive cough. In contrast, a nonproductive (dry) cough does not bring up phlegm and is more common with asthma, allergies, flu, ...
The cough started when I was around 25 or 26 ... I decided to see a primary care physician, who suspected I had allergies. I then saw multiple specialists who agreed that I was experiencing ...