Bile acid diarrhea , Overflow diarrhea Diarrhea that comes on suddenly is often caused by an intestinal infection. Other causes include food allergy, stress, and certain medications.
Long-term diarrhea is often due to an intestinal disorder, such as irritable bowel syndrome, Crohn’s disease , celiac disease, ulcerative colitis, colon cancer , or a condition called bile acid diarrhea (in which diarrhea results from digestive juices called bile acids remaining in the intestine instead of being reabsorbed).
Long-term constipation can sometimes cause overflow diarrhea, in which a solid fecal mass in the rectum leads to leakage of watery feces. Diarrhea often clears up by itself in a day or two. To prevent dehydration, plenty of fluids should be drunk. Medical advice should be sought if diarrhea persists.
If a baby or elderly person shows signs of dehydration, prompt medical attention is necessary