Abstract
Introduction: 
 Thyrotoxic Hypokalemic Periodic Paralysis (THPP) is a rare hereditary disorder which is characterized by thyroid hormone elevation, low blood potassium level and recurrent acute muscle weakness. Basic pathology is thought to be the increase in activity in the sodium-potassium pump (Na+/K+ATPase). 
 
 Case report: 
 Here we report the case of a 31-year-old male that presented with weakness in his legs, and inability to walk. The patient had elevated thyroid hormone levels (FT3 and FT4) and lower TSH levels, lower serum potassium levels, and recurrent acute muscle weakness. The diagnosis was made to be Thyrotoxic Hypokalemic Periodic Paralysis precipitated after intense physical activity. 
 
 Conclusion: 
 THPP is a reversible medical emergency. Early diagnosis, and rapid treatment is lifesaving. Although rare, THPP must be considered as a differential diagnosis in patients presenting with hypokalemia and paralysis.
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