1. Limbs are weak and flaccid, tendon reflex is slow or disappears, and in severe cases, it is difficult to breathe. 2. Indifferent mind, dull eyes, lethargy and unconsciousness. 3. Nausea, vomiting, abdominal distension and intestinal paralysis. 4. Palpitation and arrhythmia. More common in long-term fasting or eating less, potassium salt intake is insufficient; Excessive potassium excretion caused by vomiting, diarrhea and long-term use of diuretics such as furosemide. The main clinical manifestations are nerve and muscle dysfunction. The more potassium is lost, the faster it is, or the more Na+ and Ca+ concentrations increase at the same time, the more obvious the symptoms are. Hypokalemia is often mixed with primary symptoms, which easily delays the diagnosis and should be paid attention to. When potassium is supplemented intravenously, the urine volume must be above 30ml// hour. Don't overdo it. Intravenous injection is strictly prohibited. 1. Serum potassium is lower than 3.5 mmol/L .. Electrocardiogram showed that T wave was flat, bidirectional or inverted, and U wave appeared. 1. Actively treat the primary disease causing K+ deficiency and restore normal diet. 2. Potassium supplementation: (1) When supplementing potassium, try to take it orally if possible; If you can't take it orally, add it intravenously. (2) intravenous injection of potassium chloride, it is forbidden to push injection, generally add glucose solution drip, the concentration shall not exceed 3%, the drop rate shall not exceed 80 drops per minute; Do not drop more than 6g-8g every 24 hours. (3) When accompanied by acidosis, potassium bicarbonate can be used instead. (4) potassium glutamate can be used for patients with liver function damage. (5) When the heart is obviously involved or accompanied by magnesium deficiency, potassium magnesium L- aspartate can be used. Supplement: Young people need to find out the cause of potassium deficiency. Potassium deficiency in the elderly is mostly due to the influence of original diseases and medication. If potassium deficiency is caused by disease, potassium should be supplemented (usually potassium chloride tablets or potassium chloride solutions) while treating the disease. For potassium deficiency caused by drugs, it is generally necessary to stop taking drugs or add potassium-preserving drugs or take potassium-supplementing drugs. Food potassium supplement can eat more dried mushrooms and other foods. It is recommended to go to the hospital to find out the reason before determining.