Diarrhea leading to body weakness may be related to blood volume insufficiency, electrolyte disorders, malnutrition, etc., which can be relieved by replenishing water and electrolytes and strengthening nutrition. 1. Insufficient blood volume: due to more frequent diarrhea and less water intake, it can lead to dehydration and insufficient blood volume, which in turn can cause symptoms such as low blood pressure, weakness, and low urine output, and in severe cases, shock can occur. Dehydration should be corrected as soon as possible and enough water should be replenished. 2. Electrolyte disorders: If diarrhea is severe, it can lead to hypokalemia, hyponatremia, hypochloremia. Especially hypokalemia, which shows weakness, and when the symptoms are serious, limb paralysis, even respiratory muscle paralysis and cardiac arrest may occur. Therefore, attention should be paid to the electrolyte supplementation of diarrhea patients. 3. Malnutrition: chronic diarrhea patients, due to prolonged diarrhea, can occur nutritional absorption disorders, and then anemia, hypoproteinemia, etc., will also be manifested as weakness. Attention should be paid to patients to strengthen nutrition. Diarrhea caused by the body weakness is more serious, it is recommended to go to the regular hospital in a timely manner, timely rehydration, to correct electrolyte disorders, clear the cause of the disease, correct the cause of the disease.