iarjimphIARJIMPHIARJIMPH2709-331Xhttps://doi.org/10.47310/iarjimph.2022.v03i02.008Normokalemic Thyrotoxic Periodic Paralysis in a Young Adult Asian Male with Thyroiditis: A Case ReportKomangSeptian TrisnaJayaAgusGowindaAmijayaLuhNyomanMayaswariNiNyoman DesiDamaiyantiThyrotoxic periodic paralysis (TPP) is a rare condition characterized by muscle weakness or paralysis in hyperthyroidism patients and it is often associated with low serum potassium levels. In rare cases, TPP occurs in hyperthyroid patients with normal serum potassium, which is referred to as normokalemic TPP. Patients with TPP are usually males of Asian descent and the incidence of males compared to females ranges from 17:1 to 70:1. This condition often appears in the third decade of life. TPP is more common in Graves' disease, but it can occur with any form of thyrotoxicosis including thyroiditis. Neurological symptoms more commonly affect the lower limbs, and weakness is usually in proximal than distal muscles. Examination of sensory, cranial nerve, respiration, bowel, and bladder function are usually unaffected. There is widespread evidence that TPP results from a combination of genetics, hyperthyroidism, and environmental factor. Management of TPP is a combination of definitive therapy for hyperthyroidism, correction, and monitoring of serum potassium levels while avoiding precipitating factors. Here we report a case of a 37-year-old Asian male who presented with sudden weakness in the bilateral lower limb with a tingling sensation. He is on regular medication for hyperthyroidism due to thyroiditis. Serum potassium levels are normal during acute attacks and before being discharged. The patient improved his clinical condition with low-dose oral potassium chloride and continued treatment of hyperthyroidism.