My husband had an NG tube when he was in hospital for pneumonia in October. He did not complain about discomfort. It was only a problem because the nurses couldn't just insert it because of the narrow passage down the nose to the throat (another side effect of radiation) and he had to be sedated and sent to endoscopy to get it done. Swallowing for him deteriorated over time. Within six months, he went from being able to swallow liquids to aspirating on them. The speech path said even his saliva could go down the wrong way and, over time, it would catch him with him and he would get another bout of pneumonia. I am concerned for your husband because my husband ended up getting pneumonia pretty well non-stop for half a year. Please be vigilant, especially if he gets a temperature or experiences chills and coughs.