Celiac disease causes far more than stomach trouble. It triggers symptoms across your entire body, from chronic digestive problems to nerve tingling, skin rashes, and bone loss. About 1 in 133 Americans has celiac disease, but many go undiagnosed because the symptoms are so varied that they mimic other conditions. Here are 15 symptoms to know.
Digestive Symptoms
The “classic” celiac symptoms are gastrointestinal, and they’re more common in children than adults. When someone with celiac disease eats gluten, their immune system attacks the lining of the small intestine, damaging the tiny finger-like projections (villi) that absorb nutrients. That damage produces a predictable set of gut problems.
1. Chronic diarrhea. Frequent, loose stools are one of the hallmark signs. In celiac disease, stools are often greasy, bulky, and foul-smelling because fats aren’t being properly absorbed.
2. Bloating and gas. Persistent abdominal bloating that doesn’t resolve with dietary tweaks is a red flag, especially when it occurs alongside other symptoms on this list.
3. Abdominal pain. Cramping or a dull ache in the belly, particularly after meals containing wheat, barley, or rye.
4. Nausea or vomiting. Some people experience nausea regularly without an obvious cause. Vomiting is less common but does occur.
5. Constipation. Not everyone with celiac disease gets diarrhea. Some experience the opposite, which is one reason the condition gets missed.
6. Lactose intolerance. Damage to the intestinal lining can destroy the cells that produce lactase, the enzyme needed to digest dairy. This means milk, cheese, and ice cream may suddenly cause cramps and diarrhea. In many cases, lactose tolerance returns once the gut heals on a gluten-free diet.
Fatigue and Nutrient Deficiencies
Because celiac disease impairs your small intestine’s ability to absorb nutrients, deficiencies are extremely common at the time of diagnosis. A Mayo Clinic study found that about 31% of newly diagnosed patients had low iron stores, 19% had low vitamin D, and vitamin B12 deficiency was nearly three times more common in celiac patients than in the general population. These deficiencies drive several of the symptoms below.
7. Iron-deficiency anemia. Anemia is the second most frequent way celiac disease shows up in adults, present in roughly 20% of patients at diagnosis. It causes pale skin, shortness of breath, and a general feeling of being run down. Many people are treated for anemia for years before anyone checks for celiac disease as the underlying cause.
8. Chronic fatigue. Even without full-blown anemia, the combination of poor nutrient absorption and ongoing inflammation leaves many people feeling persistently exhausted. This isn’t the kind of tiredness that a good night’s sleep fixes.
Bone and Joint Problems
9. Bone loss (osteoporosis or osteopenia). Poor absorption of calcium and vitamin D weakens bones over time. In one study, about 10% of celiac patients were first identified because a bone density scan came back abnormal, and a full 50% of patients in another study had reduced bone density. This matters because it raises the risk of fractures, sometimes in people who seem otherwise too young for bone problems.
10. Joint pain. Inflammation driven by the immune response to gluten can cause aching in the joints. This symptom often overlaps with other autoimmune conditions that are more common in people with celiac disease, including type 1 diabetes and Hashimoto’s thyroiditis.
Skin and Mouth Symptoms
11. An intensely itchy skin rash. The celiac-specific rash, called dermatitis herpetiformis, produces clusters of small blisters and raised bumps that itch and burn. It typically appears symmetrically on the elbows, knees, buttocks, lower back, and the back of the head. The itching is so intense that the blisters usually get scratched open before they’re even noticed, which can make the rash look more like raw, irritated patches than distinct blisters. Not everyone with celiac disease develops this rash, but when it appears, it’s considered strong evidence of the condition.
12. Dental enamel defects. Pitting, grooves, or discolored spots (white, yellow, or brown) on the permanent teeth are a telltale sign, especially in children. These defects happen because the teeth were developing during a period of poor nutrient absorption and can’t be reversed once they form.
Neurological Symptoms
13. Peripheral neuropathy. Tingling, numbness, or burning sensations in the hands and feet affect a surprisingly large number of celiac patients. Research has found that about 39% of people with celiac disease meet criteria for peripheral neuropathy, compared with roughly 21% in a healthy comparison group. Even after accounting for other risk factors like diabetes and B12 deficiency, celiac disease more than doubled the odds of nerve damage.
14. Brain fog and headaches. Difficulty concentrating, poor memory, and recurring headaches are frequently reported. These cognitive symptoms can be subtle enough that people chalk them up to stress or aging, but they often improve significantly on a strict gluten-free diet.
Symptoms More Common in Children
15. Failure to thrive and growth delays. In infants and young children, celiac disease can slow weight gain and growth. A child who drops off their growth curve, seems unusually irritable or moody, or is significantly shorter than expected for their age may be showing signs of malabsorption that started early in life. Digestive symptoms like diarrhea and a swollen belly are more prominent in kids than in adults, who more often present with the non-digestive symptoms described above.
Why Celiac Disease Gets Missed
The biggest challenge with celiac disease is that most people don’t have all 15 symptoms. Some adults have only anemia and fatigue. Others have a skin rash and no digestive complaints at all. Children tend to show more gut symptoms, while adults are more likely to present with bone loss, neuropathy, or unexplained nutrient deficiencies. This variability is a major reason the average time to diagnosis has historically been measured in years, not months.
Celiac disease also travels with other autoimmune conditions. People with type 1 diabetes and Hashimoto’s thyroiditis have a high enough prevalence of celiac disease that screening is recommended for both groups. The conditions share genetic risk factors, particularly certain immune system genes involved in how the body presents proteins to immune cells.
How Celiac Disease Is Diagnosed
Diagnosis typically starts with a blood test that measures antibodies your immune system produces in response to gluten. The most common screening test has a sensitivity as high as 100% and a specificity up to 100%, making it a reliable first step. If the blood test is positive, an upper endoscopy with a biopsy of the small intestine confirms the diagnosis by looking for damage to the intestinal villi.
One critical detail: you need to be eating gluten for these tests to work. If you’ve already gone gluten-free before testing, the antibodies may drop to normal levels and the intestinal damage may start to heal, which can produce a false negative result. If you suspect celiac disease, get tested before eliminating gluten from your diet.
What Happens After Diagnosis
The only established treatment is a strict, lifelong gluten-free diet. That means completely eliminating wheat, barley, and rye, including hidden sources in sauces, processed foods, and even some medications. For most people, symptoms begin improving within weeks, though full intestinal healing can take months to a couple of years in adults.
Nutrient deficiencies typically improve as the gut heals and absorption returns to normal. Bone density can partially recover on a gluten-free diet, particularly when calcium and vitamin D levels are restored. Lactose intolerance caused by intestinal damage often resolves as well, allowing dairy back into the diet over time. The skin rash responds to gluten removal, though it can take longer to clear than digestive symptoms.