[Thyrotoxic periodic paralysis: an exceptional case report in Spanish population].

Thyrotoxic periodic paralysis is a rare clinical manifestation of thyrotoxicosis in spanish population. Patients show weakness and frecuently, paralysis and low levels of potassium in serum. The episode can be triggered by eating high carbohydrate diet, exercise, stress and some drugs. We present a new case of thyrotoxic periodic paralysis in a Grave's disease patient. Only four cases have been reported in the spanish literature. We conclude that a functional evaluation of thyroid gland is necessary in thyrotoxic periodic paralysis patients.