I don't get sick often enough to notice a pattern (knock on wood) but I do know one of my worst recent manic episodes happened while I had a cold, and I was taking over-the-counter cold medication. I read later that something in the medication, I think it was the cough suppressant, could exacerbate mania.

Then again, next time I had a cold I tried to get the same results (not recommended) and nothing happened.