eng Science and Education Publishing American Journal of Medical Case Reports 2374-216X 2017-03-07 5 2 48 49 10.12691/ajmcr-5-2-7 AJMCR2017527 article Zainab Jalal 1 Asad Ullah asad-86@live.com 2 Ladan Mohammadi 2 Jeanne Spencer 2 Department of Family Medicine, Conemaugh Memorial Medical Center, Johnstown, PA Department of Internal Medicine, Conemaugh Memorial Medical Center, Johnstown, PA Thyrotoxic hypokalemic periodic paralysis (THPP) is a sporadic form of hypokalemic periodic paralysis (HPP), a rare disease which is manifested as painless muscle weakness in the presence of hyperthyroidism and hypokalemia. Our patient was recently diagnosed with hyperthyroidism due to Graves' disease and was started on antithyroid therapy. He presented few months later with upper and lower extremity weakness along with finding of hypokalemia in the background of hyperthyroidism. He was given potassium replacement therapy with resolution of symptoms. http://pubs.sciepub.com/ajmcr/5/2/7/ajmcr-5-2-7.pdf thyrotoxic hypokalemic periodic paralysis hyperthyroidism hypokalemia potassium replacement