Hair shedding is similarly nonspecific. Some people experience increased hair loss after a period of physical or emotional stress. Others may have thyroid problems, inherited hair conditions, or nutritional deficiencies that need a different treatment.
When should appearance changes prompt an assessment?
Consider speaking with a healthcare professional if unusual hair shedding or brittle nails occur together with persistent fatigue, unexplained weight loss, chronic digestive problems, or known anemia.
Depending on your history and symptoms, a clinician may consider blood tests for iron deficiency, thyroid problems, or other nutritional issues. Treatment should be guided by the cause rather than by appearance alone.
Be cautious about supplements marketed as quick fixes for hair and nail growth. They may not address the underlying issue, and taking excessive amounts of certain nutrients can be harmful.
A balanced diet that supplies adequate protein, iron, and other essential nutrients supports normal hair and nail health. If a medical condition is preventing nutrient absorption, however, diet alone may not be enough. Identifying and treating the cause is the priority.
6. Recurrent Mouth Ulcers or Unusual Tooth-Enamel Changes
Mouth ulcers are common and often harmless, but repeated sores can be uncomfortable and sometimes indicate an underlying issue. They may occur because of minor injuries, stress, irritation from dental appliances, certain medications, infections, or nutritional deficiencies.
Recurring mouth ulcers have also been reported in some people with celiac disease. In certain cases, oral symptoms may be noticed before digestive problems are recognized.
Another possible clue is a defect in tooth enamel. Celiac disease that begins during childhood has been associated with changes in the formation of permanent teeth. These may include discoloration, grooves, pits, or areas where enamel appears thinner than expected.
These dental findings are not proof of gluten-related disease. Enamel defects can arise from other developmental or medical factors, while mouth ulcers affect many people who do not have celiac disease.
Nevertheless, persistent oral symptoms may be worth discussing with a dentist or doctor, especially if other unexplained symptoms are present.
What should you pay attention to?
Consider seeking advice if mouth ulcers occur frequently, take an unusually long time to heal, or make eating and drinking difficult. A clinician can assess possible causes, including nutritional deficiencies, medication effects, infections, and inflammatory conditions.
If recurring ulcers occur alongside iron-deficiency anemia, digestive symptoms, persistent fatigue, or a close family history of celiac disease, ask whether further investigation is appropriate.
A dentist may notice enamel defects or other abnormalities during a routine examination. Sharing information about your overall health can help determine whether these findings need further assessment.
Good oral hygiene and avoiding foods that irritate an active ulcer may provide relief, but persistent sores should not be ignored. In particular, an ulcer that does not heal within a few weeks or that changes significantly deserves professional evaluation.
7. Iron-Deficiency Anemia Without an Obvious Cause
Iron-deficiency anemia is an important medical finding that can sometimes lead to the discovery of celiac disease.
Anemia develops when the body does not have enough healthy red blood cells or hemoglobin to carry oxygen effectively. Iron is essential for hemoglobin production, and the body absorbs much of its dietary iron through the upper part of the small intestine—an area that may be affected by celiac disease.
When the intestinal lining is damaged, iron absorption can become less efficient. Some people therefore develop iron deficiency even when their diet appears adequate.
The symptoms may begin gradually. A person may notice unusual tiredness, dizziness, headaches, pale skin, a racing heartbeat, or breathlessness when climbing stairs. Exercise may feel more difficult, and ordinary tasks may require more effort than before.
In other cases, anemia is discovered during routine blood testing before the person recognizes any symptoms.
There are many possible causes of iron deficiency, including heavy menstrual bleeding, pregnancy, inadequate dietary intake, blood loss from the digestive tract, and other conditions that interfere with absorption. Low iron does not automatically mean that gluten is responsible.
Why recurring iron deficiency deserves attention
If iron levels remain low despite appropriate treatment, or anemia returns after improving, a healthcare professional may investigate whether iron is being absorbed properly or whether blood loss is occurring.
Celiac testing may be considered when anemia has no clear explanation, particularly if the person also experiences digestive symptoms, unexplained weight loss, or a family history of celiac disease.
Tests may include a complete blood count and measurements of ferritin and other iron markers. Further investigations depend on the person's age, symptoms, medical history, and initial results.
Do not assume that taking iron indefinitely is the only solution. Supplements can be useful when prescribed or recommended appropriately, but they may also cause constipation, nausea, and abdominal discomfort. Persistent deficiency requires attention to the underlying cause.
If you have been diagnosed with iron-deficiency anemia, ask your clinician what may be causing it and whether further investigation is needed. Identifying the reason can be more valuable than repeatedly treating the deficiency without understanding why it occurs.
8. Joint Pain, Bone Discomfort, or Unexpected Muscle Weakness
Joint pain is common and can arise from exercise, injuries, arthritis, inflammation, or many other conditions. It is not usually a reason to assume that gluten is causing a problem. However, joint or bone discomfort can occur in some people with celiac disease, and unexplained symptoms may deserve investigation when other warning signs are present.
One possible connection involves nutrient absorption. When untreated celiac disease interferes with the absorption of calcium and vitamin D, bone health may be affected. Over time, some people develop reduced bone mineral density, including osteopenia or osteoporosis. In certain cases, poor bone mineralization can lead to osteomalacia, which may cause bone pain and muscle weakness.
These complications do not occur in everyone with celiac disease. Risk varies according to factors such as the duration and severity of the condition, nutritional status, age, and other health circumstances.
A person may notice persistent aching, reduced physical strength, or discomfort that does not seem to match their usual activity. Some may discover low bone density during a medical assessment before they experience obvious symptoms.
Yet the same symptoms can have many unrelated causes. Osteoarthritis, inflammatory arthritis, injuries, vitamin deficiencies, thyroid disorders, and other medical conditions may all contribute to joint or bone pain.
How the digestive system can affect the bones
The intestine helps the body absorb nutrients needed to maintain bones, muscles, nerves, and other tissues. When absorption is impaired over a long period, the effects may appear far beyond the digestive tract.