The main reasons why diarrhea causes the whole body to feel cold are intestinal infection, energy loss, electrolyte disorders and so on. 1. Intestinal infections: If diarrhea is caused by viral or bacterial infections of the intestinal tract, the infection of germs will cause the thermoregulatory center to become abnormal, leading to an increase in body temperature and excessive heat dissipation, resulting in cold symptoms. 2. Energy loss: diarrhea can lead to a large amount of nutrients in the gastrointestinal tract are not fully absorbed out of the body, resulting in the loss of nutrients in the human body, the energy conversion is reduced, there may be a feeling of cold. 3. Electrolyte disorders: diarrhea will cause the body to discharge a large amount of water, leading to dehydration and electrolyte disorders, low blood potassium, low blood sodium, etc., so that the excitability of the body tissues is reduced, heat production is reduced, which leads to the emergence of the whole body feel cold. When these symptoms occur, it is important to seek medical attention in time to avoid serious harm to your health.