My husband spent 5 days in hospital being treated for flu (pneumonia) with antibiotics and an anti viral. He has stage 4 advanced prostate cancer and due to poor blood levels (low platelets as a result of his flu probably) we have had to delay his radiation treatment. His cough however is no better and he can have bouts lasting up to an hour and as he has extreme fatigue it is exhausting for him. He has a small lesion in his lung disguised 6 months ago, do you think this could be causing the cough or would it be too early for that to be a problem?