A few days ago I pulled my lower back at work, for the first day and a half it was pretty painful, sort of like when you wake up with a kink in your neck , that pain. The pain has now mainly gone away, I only really feel it in the mornings when I wake up. It s almost as if, once my lower back muscles are not in use they cramp up. Today though, and all last night, I have been experiencing frequent watery diarrhea . Just inquiring if the two are related and what I can do about it. Thanks.