Lactose intolerance occurs when the intestine cannot fully digest lactose, the sugar found in milk and dairy. Below are common signs, how clinicians evaluate the problem, and practical everyday approaches that may reduce symptoms without giving personalized medical advice.
Lactose is milk sugar normally broken down by the enzyme lactase in the small intestine. When lactase is low or absent, lactose reaches the colon where bacteria ferment it, producing gas and drawing water into the bowel. This can cause symptoms such as bloating, cramps, flatulence and diarrhea. The condition can appear at different ages, from childhood to adulthood.
Symptoms typically follow consumption of milk or dairy and include abdominal pain, bloating, gas and loose stools. Symptom severity varies between people. Seek urgent medical evaluation if you have severe abdominal pain, high fever, bloody stools, persistent vomiting or signs of dehydration. For ongoing symptoms that affect daily life, consult your primary care clinician or a gastroenterologist.
Evaluation usually begins with a clinical history linking symptoms to dairy intake. Clinicians may use tests such as the hydrogen breath test in adults, stool acidity tests in infants, or a supervised elimination and re-challenge of lactose-containing foods. The choice of tests depends on age, symptom pattern and other findings; a healthcare professional can recommend appropriate testing.
Management is individualized. Many people reduce symptoms by limiting high-lactose foods or choosing lactose-free dairy alternatives. Some tolerate fermented dairy like certain yogurts better; portion size and food combinations matter. Maintain adequate calcium and vitamin D from other foods or fortified products and consult a dietitian for balanced nutrition when modifying the diet.
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