© 2005-2020 Healthline Media a Red Ventures Company. Lactose is a type of sugar found naturally in the milk of most mammals.Lactose intolerance is a condition characterized by symptoms such as stomach pain, bloating, gas and diarrhea, which are caused by lactose malabsorption.In humans, an enzyme known as lactase is responsible for breaking down lactose for digestion.

© 1998-2020 Mayo Foundation for Medical Education and Research (MFMER). In the colon, normal bacteria interact with undigested lactose, causing the signs and symptoms of lactose intolerance.There are three types of lactose intolerance. Lactose intolerance is just one of many things that can cause these symptoms. A single copy of these materials may be reprinted for noncommercial personal use only. Lactose is a type of sugar found naturally in the milk of most mammals. The pain is usually located around the navel and in the lower half of the tummy. In fact, 2–20% of any carbohydrates consumed will reach the colon undigested in healthy people (Finally, there are many other causes of diarrhea apart from lactose intolerance. This involves ingesting 1.8 ounces (50 grams) of lactose and testing for elevated levels of hydrogen in the breath, which are caused by bacteria fermenting lactose in the colon (Interestingly, up to 20% of people with lactose malabsorption will not test positive, and some people who test positive will have no symptoms at all (This is because not all people with malabsorption have lactose intolerance.Lactose intolerance is defined by the presence of reported symptoms, and that depends on how sensitive a person is to the effects of malabsorption, as well as the amount of lactose in their diet (Treatment of lactose intolerance usually involves restriction or avoidance of high-lactose foods such as milk, cheese spread, cream and ice cream (Additionally, people often tolerate fermented milk products such as cheese and yogurt better, so these foods may help people meet their calcium needs without causing symptoms (Lactose intolerance is very common, affecting up to 70% of people worldwide.The most common symptoms include stomach pain, bloating, diarrhea, constipation, gas, nausea and vomiting.There have been reports of other symptoms, such as headaches, fatigue and eczema, but these are rarer and not well established. Methane is thought to slow down the time it takes food to move through the gut, leading to constipation in some people (Thus far, the constipating effects of methane have only been studied in people with Other causes of constipation include dehydration, a lack of fiber in the diet, certain medications, irritable bowel syndrome, diabetes, hypothyroidism, Parkinson's disease and hemorrhoids (While the primary recognized symptoms of lactose intolerance are gastrointestinal in nature, some case studies have reported other symptoms, including (However, these symptoms have not been established as true symptoms of lactose intolerance and may have other causes (Additionally, some people with a milk allergy may mistakenly attribute their symptoms to lactose intolerance.In fact, up to 5% of people have a cow's milk allergy, and it’s more common in children (A milk allergy and lactose intolerance aren’t related. This intolerance which normally occurs after the age of 21 i.e. Diseases associated with secondary lactose intolerance include intestinal infection, celiac disease, bacterial overgrowth and Crohn's disease.Treatment of the underlying disorder might restore lactase levels and improve signs and symptoms, though it can take time.It's possible, but rare, for babies to be born with lactose intolerance caused by a lack of lactase.

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