Lactose intolerance means that you cannot digest foods with lactose in them. Lactose is the sugar found in milk and foods made with milk. After eating foods with lactose in them, you may feel sick to your stomach. You may also have:
- Swelling in your stomach
Your doctor may do a blood, breath or stool test to find out if your problems are due to lactose intolerance.
Lactose intolerance is not serious. Eating less food with lactose, or using pills or drops to help you digest lactose usually helps. You may need to take a calcium supplement if you don't get enough of it from your diet, since milk and foods made with milk are the most common source of calcium for most people.
NIH: National Institute of Diabetes and Digestive and Kidney Diseases
- Allergic to Milk? Some Dark Chocolate Labeled as Dairy-Free May Still Contain Milk (Food and Drug Administration) Also in Spanish
- Food Intolerance vs. Food Allergy: What's the Difference? (Mayo Foundation for Medical Education and Research) Also in Spanish
- Milk Allergy (Mayo Foundation for Medical Education and Research) Also in Spanish
- What People with Lactose Intolerance Need to Know about Osteoporosis (National Institute of Arthritis and Musculoskeletal and Skin Diseases)
- Lactose intolerance: MedlinePlus Genetics (National Library of Medicine)
- ClinicalTrials.gov: Lactose Intolerance (National Institutes of Health)
Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: The Perception of Lactose-Related Symptoms of Patients with Lactose Malabsorption.
- Article: Prevalence of Lactose Intolerance in Patients with Hashimoto Thyroiditis and Impact...
- Article: Short-Term Dairy Product Elimination and Reintroduction Minimally Perturbs the Gut Microbiota...
- Lactose Intolerance -- see more articles
- Lactose Intolerance (Department of Health and Human Services, Office on Women's Health)