<<Disclaimer: Verify this information before applying it to your situation.>> Muscle weakness in celiac disease could be due to mnay things including Myasthenia gravis lupus Low calcium or magnesium, potassium poor nutrition polymyositis neuropathy sjogren's syngdrome( fatique) Anemia, addison's disease This list is not organised as to the frequency of these things occur .. there are other inheritied muscle problems that can be seen but do not occur in any greater frequency in CD than other conditions. Not medical advice Joe Murray University of Iowa