Thyrotoxic periodic paralysis.

Thyrotoxic periodic paralysis is a thyroid-related disorder that is manifested as recurrent episodes of hypokalemia and muscle weakness lasting from hours to days. The periodic paralysis has been associated with thyrotoxicosis from various etiologies. Although the incidence of the disorder is relatively higher among Asians, it has been reported in many other ethnic groups. We review the literature and report the ninth and tenth cases of thyrotoxic periodic paralysis in black patients.