Significant illnesses or a major trauma including spinal cord injury can induce the changes of thyroid hormone metabolism, leading to the findings of "Euthyroid Sick Syndrome(ESS)". The physicians should be aware of these changes in order to interpret thyroid function test correctly after the spinal cord injury.

We report three cases of ESS after the spinal cord injury. On a routine evaluation, they showed a low serum T3 level, and the T3 level returned to the normal range on a follow up study without any specific treatment.