Trace elements include iron, zinc, copper, manganese, chromium, selenium, molybdenum, cobalt, etc. The content of these elements in the human body is minimal, but they have an important role in maintaining endocrine balance and the body’s basic metabolism, among which the more important ones include calcium ions, sodium ions, potassium ions, magnesium ions, chloride ions, etc. Potassium ions in the human body are between 3.5-5.5 mmol/L, and the level is within the normal range to ensure the normal pumping function of the heart. If hyperkalemia or hypokalemia occurs, it can cause cardiac arrhythmia. In addition, it can also affect the normal movement of muscles, which can lead to difficulty in breathing and cause hypoxia and cyanosis. Iron ion is also a trace element, and keeping it within the normal range helps prevent anemia. Therefore, prompt iron supplementation is required in the clinical treatment of anemia.