Lower left side tenderness before bm. why?

Constipation?: Are you constipated or having diarrhea? Any blood in the stool? Sounds like you need to see your doctor to get this checked out. A gynecologic problem may present this way as well.

Colitis: If colon is inflamed will hurt will fecal matter passes through - use choline or phosphadylcholine with bromelein to relieve pain and limonene 2-3 drops with water sip whenever you feel pain.