You're doing your business, and then suddenly you experience a rush of diarrhea when you've been constipated for days. So what's happening? This is overflow diarrhea, and many people don't realize that diarrhea can actually be a sign of severe constipation. 🚽Here's what's going on: Hardened stool gets stuck in your colon, creating a blockage. Liquid stool builds up behind it under high pressure, then seeps around the hardened mass and leaks out through the anus—often suddenly and without warnin