Osmotic diarrhea is when undigested material reduces how much water and electrolytes the bowels can absorb. It can occur when a person’s body has difficulty digesting certain foods, such as lactose.

Poop irregularities may be more “regular” than you think. In a new Health survey of 2,001 adults in the U.S., a third of respondents reported poop abnormalities in the past month, such as seeing blood ...