I’ll admit just one thing to that list, “dry air”. It makes my nose dry and increases pressure in my head though the lingering possibility that I have a brain tumor flying under the radar hiding behind sinus congestion is always a possibility.

No way to know but I’d better eat an apple and pound a quart of water just to be sure. I’m sure I have some peanuts and raisins around here too and I should eat a whole head of broccoli just in case… If the head ache goes on past that I try a nap before I get fancy chemicals involved.