Patients with hyperthyroidism accompanied by hyperkalemia generally do not need long-term potassium supplementation and are advised to consult their doctors. If hyperthyroidism is caused by hyperkalemia, patients can follow the doctor’s instruction to treat it through temporary supplementation of potassium, and generally do not need to rely on long-term potassium supplementation after hyperkalemia is corrected; at this time, under the guidance of the doctor, the use of methimazole, propylthiouracil, and other antithyroid medications, or iodine radiation and other ways of active treatment of hyperthyroidism, which can effectively avoid the occurrence of hyperkalemia. Since hyperthyroidism may cause hypokalemia, hyperthyroid patients can eat some potassium-rich foods, such as bananas, in moderation in daily life, which can also prevent hypokalemia. Patients diagnosed with hyperthyroidism with hypokalemia should actively cooperate with doctors for treatment, and should not blindly supplement potassium on their own.