My husband makes a very loud, sudden involuntary snorting noise most of the times that he sniffs and swallows, or sometimes just when he swallows. It sounds like it's coming from his nose, and it's the worst when he's sick or dealing with allergies, but still happens when he's entirely well. He says he's had this problem since he was a kid. It doesn't seem to bother him because he's never done anything to get it looked at, but it really bothers me because of my misophonia.
Can you help me figure out what's causing it? I can't find any information on it online.