What Is Celiac Disease?
Celiac disease is a serious autoimmune disorder in which the ingestion of gluten — a protein found in wheat, barley, and rye — triggers an immune response that damages the small intestine. Specifically, the immune system attacks the villi, the tiny finger-like projections that line the small intestine and are responsible for nutrient absorption. Over time, this damage leads to malabsorption of essential nutrients and can affect nearly every organ system in the body.
Celiac disease affects approximately 1 in 100 people worldwide, though it is estimated that up to 80% of those with the condition remain undiagnosed. It can develop at any age in genetically predisposed individuals after the introduction of gluten into the diet. Left untreated, celiac disease can lead to serious health complications including osteoporosis, infertility, neurological conditions, and an increased risk of certain cancers.
Common Symptoms
Celiac disease presents with a wide range of symptoms that vary significantly between individuals. Some patients have classic gastrointestinal symptoms, while others present with primarily non-intestinal manifestations.
Gastrointestinal Symptoms
- Chronic diarrhea or constipation
- Bloating and abdominal distension
- Abdominal pain and cramping
- Nausea and vomiting
- Foul-smelling, pale, fatty stools (steatorrhea)
- Excessive gas
- Lactose intolerance (often a secondary consequence of villous damage)
Non-Gastrointestinal Symptoms
- Iron deficiency anemia: Often the only presenting sign, resistant to oral iron supplementation
- Fatigue and weakness
- Bone or joint pain: Due to calcium and vitamin D malabsorption leading to osteopenia or osteoporosis
- Dermatitis herpetiformis: An intensely itchy, blistering skin rash typically on the elbows, knees, and buttocks
- Mouth ulcers (aphthous stomatitis)
- Neurological symptoms: Peripheral neuropathy, ataxia, headaches, and cognitive difficulties ("brain fog")
- Dental enamel defects: Particularly in children
- Delayed growth and failure to thrive: In children
- Infertility and recurrent miscarriage
- Elevated liver enzymes: Sometimes the first laboratory abnormality detected
Causes and Risk Factors
Celiac disease requires three elements to develop: genetic susceptibility, gluten exposure, and an environmental trigger that initiates the immune response.
- Genetics: Nearly all celiac patients carry the HLA-DQ2 or HLA-DQ8 gene. However, approximately 30 to 40% of the general population carries these genes, meaning additional factors are required for the disease to develop
- First-degree relatives: People with a parent, child, or sibling with celiac disease have a 1 in 10 risk of developing the condition
- Associated autoimmune conditions: Type 1 diabetes, autoimmune thyroid disease, autoimmune liver disease, Addison's disease, and Sjogren's syndrome increase risk
- Other genetic conditions: Down syndrome, Turner syndrome, and Williams syndrome are associated with higher celiac prevalence
- Environmental triggers: Gastrointestinal infections, changes in the gut microbiome, emotional stress, surgery, or pregnancy may trigger the onset in genetically susceptible individuals
Diagnosis
Accurate diagnosis of celiac disease requires testing while the patient is still consuming gluten. Dr. Khan uses a systematic approach:
- Serologic testing (blood tests):
- Tissue transglutaminase IgA antibody (tTG-IgA) — the primary screening test with over 95% sensitivity and specificity
- Total serum IgA level — to check for IgA deficiency, which can cause false-negative results
- Deamidated gliadin peptide (DGP) IgG antibody — used when IgA deficiency is present
- Endomysial antibody (EMA) — highly specific confirmatory test
- Upper endoscopy with duodenal biopsies: The gold standard for confirming celiac disease. At least 4 to 6 biopsies are taken from the duodenum to look for characteristic changes including villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes (classified using the Marsh-Oberhuber scale)
- Genetic testing (HLA-DQ2/DQ8): Useful primarily for ruling out celiac disease — if these genes are absent, celiac disease is extremely unlikely
- Capsule endoscopy: May be used in cases where standard biopsies are inconclusive or to assess the extent of small bowel involvement
Treatment Options
The only effective treatment for celiac disease is a strict, lifelong gluten-free diet. There are no medications that can prevent the damage caused by gluten in celiac patients.
Gluten-Free Diet
- Complete elimination of gluten: All foods containing wheat, barley, rye, and their derivatives must be avoided. This includes many processed foods, sauces, soups, and condiments where gluten may be a hidden ingredient
- Safe grains and starches: Rice, corn, quinoa, millet, sorghum, buckwheat, amaranth, and certified gluten-free oats
- Naturally gluten-free foods: Fruits, vegetables, meat, fish, poultry, legumes, nuts, seeds, and dairy products
- Cross-contamination prevention: Using separate cooking utensils, toasters, and preparation surfaces; reading labels carefully; and understanding food labeling laws
- Dining out safely: Communicating with restaurant staff about celiac disease requirements
Nutritional Supplementation
Because celiac disease causes malabsorption, patients often need supplementation for:
- Iron
- Calcium and vitamin D
- Folate and vitamin B12
- Zinc
- Fiber (if dietary intake is low on a gluten-free diet)
Ongoing Monitoring
Dr. Khan recommends regular follow-up including:
- Repeat serologic testing (tTG-IgA) at 6 and 12 months after starting the gluten-free diet, then annually, to confirm antibody levels are declining
- Bone density screening (DEXA scan) at diagnosis and as clinically indicated
- Annual blood work to monitor for nutritional deficiencies
- Follow-up endoscopy to confirm mucosal healing, typically 1 to 2 years after diagnosis
- Assessment for associated autoimmune conditions
Potential Complications
Untreated celiac disease or continued gluten exposure can lead to:
- Osteoporosis and fractures
- Iron deficiency anemia and other nutritional deficiencies
- Infertility and adverse pregnancy outcomes
- Lactose intolerance
- Enteropathy-associated T-cell lymphoma (EATL): A rare but serious intestinal cancer
- Small bowel adenocarcinoma
- Refractory celiac disease: Persistent symptoms and villous atrophy despite a strict gluten-free diet
When to See a Doctor
You should consult a gastroenterologist if you experience:
- Chronic digestive symptoms such as diarrhea, bloating, or abdominal pain
- Unexplained iron deficiency anemia, especially if resistant to oral iron
- Unexplained weight loss, fatigue, or nutritional deficiencies
- Dermatitis herpetiformis (itchy blistering rash)
- A family history of celiac disease, particularly with any GI symptoms
- An existing autoimmune condition (type 1 diabetes, thyroid disease) with new GI symptoms
- Recurrent mouth ulcers or dental enamel defects
- Unexplained infertility or recurrent pregnancy loss
Dr. Amber Khan at GastroCares provides expert diagnosis and management of celiac disease, including serologic testing, endoscopic evaluation, dietary guidance, and long-term monitoring to ensure optimal health outcomes.