7) Stool with a foul odor
Depending on the amount of undigested lactose within the intestinal lumen (although a small amount will be enough in some people), an increase in osmolarity will occur and, to make things even for it, there is an outflow of water from the body into the digestive tract. This mechanism stimulates the contraction movements of the gastrointestinal tract and the subsequent progression of lactose and water to the large intestine, with diarrhea. Once there, the intestinal flora is in charge of minimize lactose and also process the monosaccharides.
These liquid stools, mixed with gases, will tend to be greenish-yellow, foamy, acidic, noisy and of a very particular smell. Its contact with the perineal skin can cause sunburn, known as diaper erythema. Due to the increased movement of the intestines, the intestinal transit time is shortened. Additionally, there is increased abdominal pain, and feeling of urgency to defecate.