Probability of Having Celiac Disease
1 in 100 (1%)
Lifetime probability in US
About 1% of the US population has celiac disease, an autoimmune reaction to gluten, though most cases remain undiagnosed.
Celiac disease affects approximately 1% of the US population (about 3 million people), though an estimated 80% of cases remain undiagnosed. It is an autoimmune condition where ingesting gluten (a protein in wheat, barley, and rye) triggers an immune response that damages the small intestine's lining.
Risk factors include having a first-degree relative with celiac disease (risk increases to about 10%), type 1 diabetes, Down syndrome, Turner syndrome, autoimmune thyroid disease, and certain genetic markers (HLA-DQ2 and HLA-DQ8, present in over 95% of celiac patients but also in about 30% of the general population). Celiac disease can develop at any age.
Symptoms vary widely, from classic gastrointestinal symptoms (diarrhea, bloating, weight loss) to non-GI manifestations (anemia, osteoporosis, fatigue, joint pain, neurological symptoms, skin rash). Diagnosis involves blood tests for specific antibodies (tissue transglutaminase IgA) followed by small intestinal biopsy. The only treatment is a strict lifelong gluten-free diet, which allows intestinal healing in most patients. Left untreated, celiac disease increases the risk of intestinal lymphoma, osteoporosis, infertility, and other autoimmune conditions.
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