Differential Diagnosis
Two months later, the patient presented with the same symptoms and required another hospital admission for IV thyroxine due to a suspicion of decreased oral levothyroxine absorption. A duodenal biopsy was taken, which has shown no evidence of H. pylori, celiac disease, or any form of dysplasia or malignancy. During that time, the patient had not taken any over-the-counter medications and confirmed compliance with the prescribed medications.