Answer:
Most commonly, bacteria gets in your digestive system and diarrhea is the body's way of flushing it out. Another cause is fiber. If you've eaten more fiber than usual, it can cause diarrhea. Very rare causes would be colon cancer or a disease such as Crohns, but again, this is rare.
First answer by Earthpoet. Last edit by Earthpoet. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 3 [recommend question].