Is Kefir Good for Stomach Aches?

Partly: kefir may be easier to tolerate when a mild stomach ache is related to lactose, because fermentation reduces some lactose, but it is not a proven pain remedy. There is no direct clinical evidence presented here that kefir relieves stomach aches, so try it cautiously only if your symptoms are mild and you usually tolerate it. For other food choices, see the best foods for stomach aches.

Is kefir a good choice for a stomach ache?

Kefir may be reasonable to try as a food, but whether it feels comfortable depends on the person and the cause of the pain. A stomach ache can accompany gas, constipation, an infection or food intolerance, among many other causes. Kefir is not a way to identify which cause is responsible.

If kefir has given you symptoms before, a stomach ache is not a reason to force yourself to drink it. Pain that is severe, worsening or repeatedly returning deserves medical attention rather than an experiment with food.

How might kefir affect digestion?

Kefir is a fermented drink that can contain live microorganisms. In milk-based kefir, fermentation reduces some of the milk sugar, called lactose. That may make it easier for some people who have difficulty digesting lactose to tolerate, although kefir can still contain enough lactose to cause symptoms.

Live cultures in kefir can interact with the gut, but that does not establish that they relieve abdominal pain. Products differ in their ingredients and cultures, and a change in what you eat or drink can itself cause temporary digestive discomfort.

Kefir is not a detox treatment. The liver and kidneys do most of the body's detoxification, while the lungs and gut also help eliminate waste. Drinking kefir does not flush toxins or replace the work of those organs.

What is the evidence for kefir and stomach aches?

Kefir has not been established as a treatment for stomach aches. No direct clinical evidence is available here to show that drinking it relieves the pain, which people might benefit or how much would help.

The fact that kefir is fermented or contains live cultures is not proof that it treats a symptom. A product's particular cultures, the amount consumed and the reason for the stomach ache could all matter. A person's good experience with kefir also cannot show that it will work for someone else.

Likewise, the lack of established benefit does not mean kefir necessarily causes pain for everyone. It means you should treat it as an optional food, not a reliable remedy or a substitute for assessment when symptoms warrant it.

How can you try kefir safely?

If your discomfort is mild and you have tolerated kefir before, start with a small amount rather than a large serving. Choose a product with ingredients you normally tolerate, and check the label for milk or other ingredients that have caused you trouble. Plain kefir may make it easier to identify what you are consuming than a product with several added ingredients.

Pay attention to how you feel afterward. If kefir increases pain, bloating or diarrhea, stop drinking it and do not keep trying to work through the symptoms. Tolerating kefir on one occasion does not prove that it caused an improvement or that it will help a different stomach ache.

Use commercially prepared kefir made with pasteurized milk, and follow the package's date and refrigeration instructions. Products vary, so a label indicating live cultures does not tell you whether a particular kefir will ease your symptoms.

If you are losing fluids through vomiting or diarrhea, replacing fluids matters more than trying kefir; see the best drinks for stomach aches for options.

Who should be careful, and when should you see a doctor?

Avoid milk-based kefir if you have a milk allergy. Lactose-free milk-based kefir can still contain milk proteins and is not safe for someone with that allergy. If you have lactose intolerance, remember that ordinary milk-based kefir may still trigger symptoms despite fermentation.

If you have irritable bowel syndrome or another digestive condition, kefir may or may not fit your usual eating plan. Ask a clinician or dietitian if you are unsure, particularly if your symptoms are changing or you are following a prescribed diet. People taking immunosuppressant medications or living with a weakened immune system should ask their clinician whether live-culture kefir is appropriate.

During pregnancy, avoid kefir made from unpasteurized milk. For children, do not use kefir in place of medical advice or appropriate fluids when they are ill, and avoid it if they have a milk allergy.

Seek urgent medical care for sudden or severe abdominal pain, a rigid abdomen, blood in vomit, or black or bloody stools. Get prompt medical advice for worsening pain, fever, repeated vomiting, inability to keep fluids down or signs of dehydration such as dizziness or much less urination. Contact a clinician if the pain does not go away or keeps returning, even if it seems mild.