Hyperthyroidism with normal blood potassium does not usually result in paralysis and weakness. Except in the case of hyperthyroid periodic paralysis with normal blood potassium, which is relatively rare. Hyperthyroidism may cause periodic paralysis, mainly due to high levels of thyroid hormones in hyperthyroid patients, which may cause potassium ions to be transferred from the extracellular to the intracellular, resulting in low levels of potassium ions in the extracellular fluid, leading to low-potassium periodic paralysis in patients. Some patients may also develop periodic paralysis with normal blood potassium. The onset of hyperthyroid periodic paralysis is often preceded by a number of prodromal symptoms, such as muscle stiffness, fatigue, abnormal sensations in the extremities, drowsiness, and headache. In addition, other causes can also cause weakness, such as hyponatremia, etc. When a patient with hyperthyroidism has normal blood potassium but is paralyzed and weak, it is recommended to go to the hospital in time to further find out the cause, and under the guidance of the doctor to carry out treatment.