Recently, the emergency department of our hospital has received some young patients with generalized paralysis one after another, more than twenty in total in more than a month from June to now, and all of them were found to be hypokalemia after emergency investigation, except for two cases with a history of recurrent episodes, the rest of them were for the first time, and some of the patients were reported to the emergency department by the laboratory department as a crisis call for severe hypokalemia. Severe hyperkalemia can lead to cardiac arrest in addition to generalized weakness and even generalized paralysis. Typical case: Patient, He, was admitted to the emergency department with a sudden inability to walk on both lower limbs, accompanied by weakened grip and numbness of both upper limbs, and inability to lift, and was found to have a blood potassium level of 2.1 mmol/L (normal 3.5-5.5 mmol/L). He was admitted to the hospital with hypokalemia and was found to be suffering from severe hyperthyroidism at the same time. Similar patients were four this month. All were the first time the patient’s thyroid disease was detected. The patient, Wang Mou, could not get up early in the morning of the second day after returning home from field work, and his whole body was paralyzed, and he was sent to the emergency department of our hospital by 120, and was admitted with 1.71 mmol/L potassium, and was discharged from the hospital with recovery of the whole body muscle strength after potassium supplementation treatment. Doctor’s analysis: Due to the high temperature in summer, the whole body loses significantly more water than at other times, and the water balance of the body is disturbed, thus, many electrolyte ions in the body, such as potassium, sodium, calcium, etc., are lost along with the synchronous loss of water and insufficiently replenished, resulting in hypokalemia. Therefore, simple hypokalemia in summer is common in patients with field work, high-temperature operation, high loss of body fluids, and urination after drinking a lot of water. In addition, if patients originally have endocrine organic diseases, such as diabetes mellitus, hyperthyroidism, primary aldosteronism, etc., their own endocrine regulation function is very poor, renal reabsorption and concentration dysfunction, usually there are varying degrees of water and electrolyte ionic balance disorders, and summer high temperature conditions aggravate the condition due to the further loss of water and electrolytes. Many patients also come to the emergency room by severe hypokalemia, thus discovering the primary endocrine diseases. Doctors remind: 1, summer high temperature must pay attention to hydration, and can not simply drink plain water, appropriate drinking salt water. 2, summer eat more fruits to replenish the lost potassium. Such as bananas, watermelon, pears. 3, consciously and appropriately eat more potassium-containing foods, such as fresh fava beans, Ma Bell Department, yam, spinach, amaranth, kelp, nori, black jujube, apricot, almonds, walnuts, peanuts, green beans, soybeans, mung beans, woolly beans, goat’s loin, pig’s loin and so on. 4.Once general weakness or even general paralysis occurs in summer, it is necessary to go to the hospital in time and should not be ignored, because severe hypokalemia can lead to cardiac arrest and death.