dizziness upon bowel movements

I have diverticulitis and about an hour or 2hours before  a large bowel movement I become very dizzy, unstable in my
gait and a little nauseaus. Is this from my diverticulits? It is not always diarrhea but usually rather a large bm.

[Ratnakar Kini, MD]

Hi,
Diverticulitis does not cause dizziness before bowel movements.
If you have blood in stools and have become anemic due to it, you may feel dizzy.