Over two years ago I had diverticulitis. Now I have it again. It hurts. It comes from not drinking enough water (true but improved in recent weeks since I've been running more), and from stress. I guess that means I'm not "resting" as well as I thought. And it hurts--feels like a knife in my left side that hurts worse when I move. Like when I breathe. Drugs have been called in (thank you, BL!), so relief is on its way.
So don't be like me and stress out till you get an Old Person's (intestinal) Disease. Seriously.