A body temperature of 35.5°C is normal. Generally, the normal body temperature is between 36°C and 37°C. A decrease in body temperature may be related to low room temperature or taking antipyretic drugs. The body’s basal body temperature varies from person to person. If the body temperature is consistently low, it is possible that the person’s basal body temperature itself is low. The patient may also have a low diet or be in a cold environment. Some people may have had a fever before, and then their body metabolism accelerates and they sweat a lot and the sweat loss also takes away some of the temperature, so they show a low body temperature. At this time, first check whether other physical conditions are good, if there is no cold limbs or chills, shivering and other conditions do not need to worry too much, pay attention to drink more water, so that the loss of water to be replenished, more temperature measurement to observe any changes. Body temperature of 35.5℃ is normal, if the body does not have other uncomfortable symptoms, it can be left alone for the time being, just pay attention to monitoring. If the body temperature continues to fall, or accompanied by other uncomfortable symptoms, promptly consult a doctor to find the cause of the disease.