(HealthDay News) -- Celiac disease is a digestive condition that usually damages the small intestine and interferes with nutrient absorption.

People who have the disease can't process the protein gluten, found in products containing wheat, rye and barley. The protein also may be found in certain medications, lip balms and vitamins.

Not every person with the disease has noticeable symptoms. But according to the National Digestive Diseases Information Clearinghouse, celiac disease may trigger these warning signs in children:

• Loss of weight.
• Pain and bloating in the abdomen.
• Persistent diarrhea.
• Vomiting.
• Constipation.
• Stools that are light in color, fatty or have a foul odor.
• Irritability.

In adults, symptoms are more likely to include:

• Anemia.
• Tiredness.
• Bone or joint pain.
• Osteoporosis.
• Depression or anxiety.
• Numbness in the extremities.
• Missed menstrual periods.