Children may contract infection from sandboxes contaminated with petsâ stool. Certain types of immature worms may penetrate through your skin during swimming or walking barefoot; when they reach the small or large intestine they grow into adult worms. Common garden worms usually do not cause illness in human.
People with lactose intolerance do not produce enough of the lactase enzyme to break down lactose. Instead, undigested lactose sits in the gut and gets broken down by bacteria, causing gas, bloating, stomach cramps, and diarrhea. Lactose intolerance is fairly common and seems to affect guys and girls equally.
1 Lactose intolerance leads to gas buildup from undigested lactose in the large intestine. 2  High fiber foods can aid in digestion, but can also produce a lot of gas. 3  Fatty foods, which can prevent the stomach from emptying efficiently.