Why does drinking milk make your stomach hurt?

Drinking milk can cause stomach discomfort for several reasons, particularly in individuals who have lactose intolerance or other underlying conditions. Here are a few reasons why milk might make your stomach hurt:

1. Lactose Intolerance: Lactose intolerance is a common condition in which the body lacks sufficient levels of the enzyme called lactase, responsible for breaking down the lactose (a sugar found in milk) into simpler sugars that the body can absorb. When an individual with lactose intolerance consumes milk or dairy products, the undigested lactose moves to the large intestine, where it's fermented by gut bacteria, producing gas and causing symptoms like bloating, flatulence, abdominal cramps, and diarrhea.

2. Milk Allergy: Some individuals may have a milk allergy, where the body's immune system overreacts to milk protein (usually casein and whey). This can lead to a range of symptoms, including digestive issues like stomach pain, nausea, vomiting, or diarrhea. An allergic reaction to milk can sometimes also manifest in other ways like skin rash, hives, eczema, respiratory problems, or even anaphylaxis in severe cases.

3. Digestive Issues: Certain gastrointestinal conditions, such as irritable bowel syndrome (IBS) or Crohn's disease, can make an individual more sensitive to certain foods and drinks, including milk. Individuals with these conditions might experience stomach pain or discomfort after consuming milk, as it can exacerbate existing digestive issues.

4. High Fat Content: Whole milk has a higher fat content compared to skimmed or low-fat milk. Drinking whole milk can sometimes lead to stomach upset in individuals with a more sensitive digestive system. The high-fat content can make it more challenging to digest, causing symptoms like stomach pain or bloating.

5. Contamination: In some cases, stomach pain after drinking milk can be caused by food contamination, particularly with bacteria. Milk that has been improperly handled, stored at improper temperatures, or consumed past its expiration date can develop bacteria that can lead to foodborne illness. This contamination can cause various symptoms, including stomach pain, nausea, vomiting, or diarrhea.

It's important to note that not everyone who experiences stomach pain after drinking milk necessarily has lactose intolerance or a milk allergy. If you're experiencing consistent digestive discomfort after consuming milk or dairy products, it's advisable to consult a healthcare professional to determine the underlying cause and receive appropriate guidance on managing your condition.