Hi I’m quite worried I’ve had chest aches for 2months. No real cough. Had chest X-ray and a E C G which came back ok. Have started with an occasional cough that brings up pieces of thick phlegm white blood in. Dr says he doesn’t think I have an infection but has referred me to chest dr. I am worried what could be the cause. I have moderate COPD. My Fev1 has deteriorated from 66% to around 53% in the past 3 months.