Hyperkalemia is a condition in which the blood potassium level is higher than 5.5 mmol/L. The common clinical symptoms of hyperkalemia include neuromuscular, cardiac, and digestive symptoms. First, when the potassium level exceeds the normal level, it may cause pain and numbness in the muscles and nerves, and when the central nervous system is involved, the patient may become apathetic and drowsy. When the respiratory muscle or laryngeal muscle is involved, it may lead to paralysis of the respiratory muscle and spasm of the laryngeal muscle, and the patient may have difficulty in breathing or even suffocation. Secondly, potassium is an important element involved in the normal cardiac physiological activities of the body. Excessive potassium levels may cause arrhythmias and cardiac arrest in patients, who may have abnormal changes in the electrocardiogram, such as shortened Q-T interval or high pointed T waves, which may cause cardiac arrest in serious cases and endanger patients’ lives. Some patients with hyperkalemia may also have digestive symptoms, such as abdominal pain, diarrhea, nausea and vomiting, and in some cases, paralytic intestinal obstruction. In general, the symptoms of hyperkalemia are diverse and may vary from patient to patient.