Lactose Intolerance Symptoms

If you are lactose intolerant, you probably feel very uncomfortable when you consume dairy products. Undigested lactose is fermented in your intestine to produce gas and acid. This can make your stomach growl, may cause you to feel bloated and to emit gas frequently, and may result in diarrhea, all of which can be embarrassing and inconvenient.



Symptoms among susceptible individuals can vary widely and usually begin between 30 minutes and two hours after consuming products that contain lactose. Symptoms can range from mild to severe. Symptom severity depends on a number of factors, including the person’s age, ethnicity, and digestion rate3  as well as the amount of lactose consumed and the degree of enzyme  insufficiency. The more lactose ingested, the more severe the symptoms.4


Symptoms are variable and can include abdominal pain, diarrhea, nausea, cramps, intestinal rumbling, flatulence (gas), and/or bloating.2,4 The amount of lactose that will cause symptoms varies from individual to individual and depends on the amount of lactose consumed, the degree of lactase  insufficiency, and the form of food in which the lactose was ingested.4



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