Stools contain what is left after your digestive system absorbs nutrients and fluids from what you eat and drink. Normal bowel function can vary from 3 bowel movements per day to 3 per week. A bowel movement is considered normal if it:
Contains no blood
Is easily passed without pain or cramping
Is well-formed
Stools will be loose and watery if your body does not absorb the fluids. Loose stools can also happen if your digestive system produces extra fluids. Loose stools contain more water, salts, and minerals and weigh more than solid stools. Diarrhea is when a person has frequent loose and watery bowel movements. Diarrhea that lasts a short time is called acute diarrhea. Acute diarrhea is a common problem. It usually lasts only 1 or 2 days, but it may last longer. Diarrhea that lasts for at least 4 weeks is called chronic diarrhea