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.
Gas may also be caused by foods that the small intestine cannot handle because it doesn't contain enough of an enzyme called lactase. This enzyme breaks down lactose, the sugar that's in milk and milk products. If lactose can't be broken down, bacteria again begin to ferment those sugars and cause flatulence. Foods and Flatulence: The Biggest Offenders. Everyone's body reacts differently to different foods â some people have no trouble digesting milk products, while other people suffer excessive gas from it.