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.
Worst: Dairy. If you feel gassy after a few slices of cheese or a bowl of cereal with milk, you may be lactose intolerant, which means your body lacks the necessary enzymes to break down lactose (the sugar found in dairy products). That can cause gas to form in the GI tract, which may trigger bloating.