I sometimes tend to cough very hard - often as long as 15-20 minutes at a time - but only a couple of times a week (most usually when I first wake up and sit up or start moving around - I have a past history for 10 or so years of asthma/COPD - but it seemed to have gone away about 5 years ago.....don't have any breathing problems....also have no sign of any blood in either sputum or stool.....I'm 68 years old - and other wise in excellent health (although overweight - but working on it)....my Blood Pressure today was 138/80 with Pulse 78.....