My dad's been dealing with this really thick white phlegm and a cough every day after he got over bronchitis a few days ago. Before, the phlegm was yellowish for about 5 or 6 days, and now it's just super thick and white. Do you think this will clear up soon? It bothers him a lot, especially because he constantly feels like he has to clear his throat when he talks. He's not running a fever or anything, and he's breathing fine. It's just this cough and phlegm that's driving him nuts. What do you think we should do?