Back when I was in school I found myself getting sick at least 3-4 times a year, but since then, I've only been sick twice in the last three years (both within a one month span). If I'm feeling anywhere above 50%, I usually just take some cold & flu medicine and get on with my day, since I don't like to take too much time off if I don't have to. What always gets me the worst though is a runny nose- even if the rest of me is feeling fine. It always makes it hard to concentrate when your nose is practically dripping and you need to keep blowing your nose, so that's basically the only time I'll stay at home.