Multiple studies have shown an association between IgA deficiency and celiac disease. Although the pathogenesis is unclear, it has been proposed that a lack of secretory IgA and Peyer patch malfunction allow for increased free gluten peptides in the submucosa. 
Patients with longstanding or refractory abdominal symptoms should be screened for celiac disease.  Patients may present with chronic or intermittent diarrhea.
Patients with longstanding or refractory abdominal symptoms should be screened for celiac disease. 
Iron deficiency anemia is the most common clinical presentation in adults. Folate (and rarely vitamin B12) deficiency may lead to a macrocytic anemia. 
Characterized by intensely pruritic papulovesicular lesions that occur symmetrically over the extensor surfaces of the arms and legs, as well as on the buttocks, trunk, neck, and scalp.  Biopsy-proven dermatitis herpetiformis almost universally occurs in association with celiac disease.
Family history of celiac disease or other autoimmune disorders.
History of bone pain or previous fracture, due to vitamin D deficiency and hypocalcemia.
Associated with iron deficiency anemia. 
Likely multifactorial, primarily due to malabsorption but also to changes in motility, metabolism, and appetite. 
In children, faltering growth and delayed puberty are indications for testing for celiac disease. 
Clinicians caring for patients with type 1 diabetes mellitus should be aware of the association with celiac disease and consider testing if there are any digestive symptoms or laboratory changes to suggest celiac disease.  Some clinicians suggest screening asymptomatic individuals with type 1 diabetes mellitus for celiac disease every 5 years but the clinical benefits of this approach are not well established. 
Clinicians caring for patients with autoimmune thyroid disease should be aware of the association with celiac disease and consider testing if symptoms occur.   Unexplained increasing need for levothyroxine or treatment-refractory hypothyroidism should also lead to celiac disease testing.   Correspondingly, patients with celiac disease should be screened for thyroid disease. 
Caused by various nutritional deficiencies, although the particular deficiency is not always evident.  May be recurrent.
The exact etiology is unclear but is felt to be due to nutritionally derived abnormalities in mineralization.
Vitamin K deficiency may lead to a coagulopathy.
The etiology of neurologic dysfunction may be the result of either vitamin deficiencies (B12, E, or D; folate or pyridoxine) or autoimmune activity against neural antigens. 
Cerebellar ataxia is one of the more common neurologic symptoms. 
Multiple studies have shown an increased risk in family members, likely secondary to genetic factors. 
Multiple studies have shown an association between immunoglobulin A (IgA) deficiency and celiac disease. Although the pathogenesis is unclear, it has been proposed that a lack of secretory IgA and Peyer patch malfunction allow for increased free gluten peptides in the submucosa. 
The association between type 1 diabetes mellitus and celiac disease is well known. It is probably based on genetic factors favoring autoimmunity, including the presence of human leukocyte antigen (HLA)-DQ2 and HLA-DQ8 and single nucleotide polymorphisms shared by both diseases.   Leaky gut, with tight junction defects leading to increased passage of luminal peptides into the submucosa, resulting in immune activation, is also hypothesized, as well as enhanced basal expression of inflammatory markers.  
Some studies have shown an increased prevalence of celiac disease in patients with Sjogren syndrome. 
A few studies have shown an increased prevalence of celiac disease in patients with Crohn disease and, to a lesser extent, ulcerative colitis. 
Studies have shown an increased prevalence of celiac auto-antibodies in patients with primary biliary cirrhosis and other liver diseases, but false positives appear higher in these populations. 
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