A person with celiac disease isn't able to absorb the nutrients from food. This problem of malabsorption can cause vitamin and mineral deficiencies. Iron deficiency from malabsorption causes anemia, which is a reduction in red blood cells. This can lead to fatigue and tiredness. Symptoms of celiac disease can include serious diarrhea, bloating, and cramps.
The food that isn't absorbed is excreted in feces. Too much diarrhea can lead to severe dehydration. Bowel movements are often bulky, light tan or grey, and frothy or rancid-smelling because the stools contain fat that couldn't be absorbed. The feces often stick to the toilet bowl because of the large amount of fat in them.
People with celiac disease often lose weight because their bodies can't absorb the much-needed nutrients from the foods they eat. Lack of vitamins and minerals may lead to many different complications. People who lack protein will have swollen legs. Lack of vitamin K causes bleeding gums. Some people's nerves will be affected and they may have trouble thinking or concentrating. Others may have dry skin or sore lips and tongue. Sometimes, people with celiac disease have osteomalacia (softening of bones) due to nutritional deficiencies.
As a result of modern testing procedures (see "Making the Diagnosis"), we now know that some people with celiac disease may not have the typical intestinal symptoms that doctors used to think were required to make the diagnosis of celiac disease. If you experience certain more general symptoms such as anemia, abnormal liver function, or arthritis, your doctor may recommend that you get tested for celiac disease. Infertility can also occur if you have celiac disease.