Celiac Sprue (Celiac Disease)

Causes

• Genetic Predisposition:
  • Celiac disease is only developed by people who carry certain genes, primarily HLA-DQ2 and HLA-DQ8. However, carrying these genes does not guarantee development of the disease, as they are common in the general population.
  • If a close relative (parent, sibling, child) has celiac disease, your risk is significantly higher.
• Gluten Ingestion:
  • Exposure to gluten (found in wheat, barley, rye) is the trigger for the autoimmune reaction.
  • The immune system mistakenly identifies gluten as a threat and mounts an attack on the small intestine lining.
• Environmental Factors (Possible Triggers):
  • Infant Feeding Practices: Some research suggests that the timing of gluten introduction to infants, particularly too early or too late, may influence risk, but this is not conclusive.
  • Viral Infections: Some studies suggest that certain viral infections might play a role in triggering celiac disease in genetically susceptible individuals.
  • Other Factors: Stress, surgery, pregnancy, or childbirth are sometimes reported as triggers for symptom onset in predisposed individuals.
• Associated Conditions (Increased Risk):
  • Type 1 Diabetes.
  • Autoimmune Thyroid Disease (e.g., Hashimoto's thyroiditis).
  • Autoimmune Liver Disease.
  • Down Syndrome.
  • Turner Syndrome.
  • Selective IgA Deficiency.
  • Microscopic Colitis.

Symptoms

• Digestive Symptoms (More common in children):
  • Diarrhea (often chronic, watery, or fatty/foul-smelling).
  • Abdominal pain and bloating.
  • Gas.
  • Nausea and vomiting.
  • Constipation (can occur in some cases).
  • Weight loss or failure to thrive (in children).
• Non-Digestive Symptoms (More common in adults):
  • Fatigue.
  • Anemia: Often iron-deficiency anemia, due to poor iron absorption.
  • Bone or Joint Pain.
  • Osteoporosis or Osteopenia: Due to poor calcium and vitamin D absorption.
  • Nerve Damage (Neuropathy): Numbness, tingling, or pain in hands and feet.
  • Dermatitis Herpetiformis: An itchy, blistering skin rash, typically on elbows, knees, buttocks, and scalp. (Specific to celiac disease).
  • Mouth Ulcers (Canker Sores).
  • Dental Enamel Defects.
  • Headaches.
  • Reproductive Problems: Infertility, recurrent miscarriage.
  • Depression and Anxiety.
  • Seizures: (Rare) can be associated with cerebral calcifications.
  • Hyposplenism: Reduced function of the spleen.

Diagnosis

• Blood Tests (to screen for celiac disease):
  • Tissue Transglutaminase IgA (tTG-IgA) Antibody: The most sensitive and specific blood test for celiac disease.
  • Endomysial IgA (EMA-IgA) Antibody: Another highly specific test.
  • Deamidated Gliadin Peptide IgA (DGP-IgA) or IgG (DGP-IgG) Antibody: Useful for those with IgA deficiency or in children.
  • Total Serum IgA: Measured to ensure IgA deficiency isn't causing a false-negative tTG-IgA result.
• Genetic Testing (HLA-DQ2 and HLA-DQ8):
  • Used to rule out celiac disease. If a person does not carry these genes, they cannot develop celiac disease.
  • It does not diagnose celiac disease, as many people with these genes do not develop the condition.
• Endoscopy with Biopsy (to confirm diagnosis):
  • Considered the gold standard for diagnosis.
  • A thin, flexible tube with a camera is inserted down the throat into the small intestine.
  • Multiple tiny tissue samples (biopsies) are taken from the small intestine to check for characteristic damage to the villi (villous atrophy, crypt hyperplasia).
• Response to Gluten-Free Diet: Improvement in symptoms after adopting a strict gluten-free diet often supports the diagnosis, especially if confirmed by biopsy.

Treatment

• Strict Gluten-Free Diet:
  • Avoid all foods containing wheat, barley, and rye. This includes most breads, pastas, cereals, baked goods, beer, and many processed foods.
  • Careful label reading: Gluten can be hidden in many ingredients and additives.
  • Beware of Cross-Contamination: Even small amounts of gluten can cause damage. Use separate toasters, cutting boards, and cooking utensils.
• Nutritional Support:
  • Vitamin and Mineral Supplements: To correct deficiencies caused by malabsorption (e.g., iron, calcium, vitamin D, folic acid, B vitamins).
  • Dietitian Consultation: Working with a registered dietitian specializing in celiac disease is crucial to learn about the gluten-free diet, ensure adequate nutrition, and identify hidden sources of gluten.
• Medications (for specific complications):
  • Corticosteroids: May be used in severe cases of refractory celiac disease (where the intestine doesn't heal despite a strict gluten-free diet) to suppress the immune response.
  • Dermatitis Herpetiformis Treatment: Dapsone may be prescribed to control the rash, in addition to the gluten-free diet.
• Monitoring:
  • Regular follow-up with a doctor and dietitian is important to monitor symptoms, nutrient levels, bone density, and ensure continued adherence to the gluten-free diet.
  • Repeat blood tests (e.g., tTG-IgA) can help monitor intestinal healing.

Living Gluten-Free: The Practical Details

A gluten-free diet is the entire treatment for celiac disease, and it fails in predictable ways: gluten hiding in foods that seem safe, symptoms blamed on gluten that come from something else, and follow-up that never happens.

What to expect in the first year

Symptoms usually ease within weeks, but the intestine heals over months to years in adults, and the antibody raised at diagnosis is rechecked at about six and twelve months to confirm it is falling. A bone density scan at diagnosis is routine because years of poor calcium absorption often leave osteoporosis or osteopenia behind, and iron, vitamin D, B12, and folate are measured and replaced. Our bone health after 50 article covers what happens next.

Where gluten hides

Soy sauce, malt vinegar and malt flavoring, beer, some processed meats, seasoning packets, and oats that are not certified gluten-free account for most accidental exposures at home. In restaurants the shared fryer does more harm than the menu, and a "gluten-free" label in the United States means under twenty parts per million, which is safe for nearly everyone.

When symptoms persist on the diet

Hidden gluten is the most common cause, and a dietitian review finds it more often than a food diary does. After that, temporary lactose intolerance from the damaged lining, small intestinal bacterial overgrowth covered in our SIBO article, irritable bowel syndrome, and microscopic colitis, which our microscopic colitis article describes, each explain a share. Refractory celiac disease is rare and is diagnosed only after these are excluded and a repeat biopsy shows persistent damage.

Relatives and the conditions that travel with it

Parents, siblings, and children have roughly a one-in-ten chance of celiac disease and are offered a tTG-IgA blood test even without symptoms, since adult disease is often silent. Hashimoto's thyroiditis and type 1 diabetes share the same autoimmune tendency, so thyroid function is checked periodically, and persistent anemia or vitamin B12 deficiency after a year on the diet is investigated rather than assumed.

What celiac disease is confused with

Feeling better off gluten is not a diagnosis: non-celiac gluten sensitivity, wheat allergy, and irritable bowel syndrome all improve on the same diet, and only celiac disease requires it to be strict and lifelong. Anyone who went gluten-free before testing needs a supervised gluten challenge to get a real answer, as our when to suspect celiac disease article explains. Our gastrointestinal team coordinates testing and follow-up. The NIDDK and the Celiac Disease Foundation publish patient guidance on the diet and follow-up.

If you were diagnosed with celiac disease and have not had antibody levels or bone density checked since, schedule a visit.