Question: why do we get stomach aches?

Laura Haworth answered on 10 Mar 2016:

Pain is the body’s way of signalling that something is going on. Stomach pain alerts us to something that’s happening inside us.
Causes of stomach aches are caused by:
-Bacterial infections cause what we call “food poisoning.” Bacteria are also responsible for other conditions that may give a person belly pain, such as pneumonia, urinary tract infections etc
-Viruses, another type of infection, are behind what we call “stomach flu.” Both bacteria and viruses can be easily passed from person to person.
-Constipation. Being constipated is one of the most common reasons for frequent belly pain. People usually become constipated because their diet doesn’t include enough fluids and fibre.
-Irritation and Inflammation. When one of the body’s internal organs becomes irritated or swollen, that can bring on belly pain. Pain from problems like appendicitis, ulcers, irritable bowel syndrome, and inflammatory bowel disease (IBD) is the body’s way of telling us to get medical help.
-Food Reactions can be more than eating too much or basic indigestion. When people are unable to digest certain foods, doctors say they have a food intolerance. Conditions like lactose intolerance often cause belly pain when someone eats the food (milk products in the case of lactose intolerance).
Conditions like celiac disease (a reaction to proteins in certain grains) or food allergies (like peanut allergy) are different from food intolerance. They involve immune system reactions that can actually harm the body beyond just producing a temporary reaction.