It's not entirely clear what causes fatigue in celiac disease and , but it's one of the top symptoms mentioned, both prior to initial diagnosis and when people are accidentally exposed to gluten following that diagnosis. One study found that 82% of newly-diagnosed celiacs complained of fatigue.
Some researchers speculate that fatigue may be caused by , at least in those with celiac disease — can mean your body doesn't absorb nutrients well.
To treat the damage caused by gluten, you need to eliminate gluten from your diet. Once you do that, your intestinal lining will begin to heal and other complications from celiac disease (such as malnutrition) should begin to resolve.