A body temperature of 35.4°C is not normal and is considered hypothermia. A normal person’s body temperature is between 36-37.3°C. If it is lower than 36°C, it is considered hypothermia. If it is higher than 37.3°C, it is considered fever. If you have a fever and your body temperature drops too much in a short period of time after using antipyretics, it is possible to have a body temperature lower than 36°C. This situation does not matter, as your body temperature will return to normal after the thermoregulatory center slowly returns to normal. If you have not used antipyretic drugs, it may be physiological or pathological. Some people’s body temperature may be lower than 36℃, which is normal if there are no uncomfortable symptoms. Some patients may have hypothyroidism or hypopituitary function, which may cause their body temperature to be lower than normal. This situation requires further examination to clarify the cause of the lower-than-normal body temperature.