<s>[INST] I ve had a persistent, productive cough for over a year, with associated breathlessness and fatigue. The mucous was initially very salty but that has abated, though it is still productive My axillary and cervical lymph nodes are not swollen or tender, I have no rashes or tenderness on any other part of my body. What do you think might be the cause? [/INST] You should have your doctor evaluate you for COPD (chronic obstructive lung disease), bronchiectasis, and congestive heart failure. You should have a chest x-ray and echocardiogram to start off with. You will also likely need pulmonary function tests and a chest CT. </s>