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• 22/07/2025

Crohn’s Disease and Lactose Intolerance: How Are They Connected?

If you have Crohn’s disease, you're likely already aware that certain foods can trigger unpleasant symptoms during a flare-up. One of the common culprits? Dairy. Interestingly, individuals with Crohn’s disease are more likely to be lactose intolerant, which means they have difficulty digesting lactose, the sugar found in dairy products.

So, what exactly is the link between Crohn’s disease and lactose intolerance?

While these two conditions are separate, having Crohn’s—especially when it affects the small intestine—can reduce your body’s ability to produce lactase, the enzyme responsible for breaking down lactose. Without enough lactase, dairy products can lead to gas, bloating, and cramps, making it hard to tell whether symptoms stem from Crohn’s or lactose intolerance.

The good news? Though dairy might cause discomfort, it doesn't worsen Crohn’s disease. However, avoiding dairy can prevent unwanted digestive trouble, even for those without lactose intolerance, due to the high-fat content in foods like ice cream or butter.

Research suggests that people with Crohn’s are up to four times more likely to have lactose intolerance than those without. Yet, avoiding dairy doesn’t necessarily make Crohn’s better, but managing both conditions can significantly improve your quality of life.

If you suspect dairy is an issue for you, it’s worth discussing with your doctor to see if a low-lactose diet or lactose intolerance testing might help.

Source: This blog is adapted from an article by Marygrace Taylor, medically reviewed by Dr. David Padua, on the connection between Crohn’s Disease and Lactose Intolerance.