[Thyrotoxic periodic paralysis in a Spanish male]

One of the few cases of thyrotoxic periodic paralysis in our country is reported. A twenty-one year old male patient with Graves disease for more than three years had a poor compliance with the therapeutical regimen, with mainly nightly episodes of self-limited limb weakness associated with hypokalemia. The patient has no familiar antecedents of periodic paralysis and the clinical manifestations resolved with treatment of hyperthyroidism.