Adults have a high fever, the body temperature reaches 39.5 degrees, which generally means that the fever caused by the disease is serious, but also need to look at the situation. Sometimes the disease that leads to fever is just a common cold, but because the body’s immune system is better, it will lead to obvious fever, this time the body temperature reaches 39.5 degrees, but the related symptoms are likely to disappear in a day or two, without causing complications, the common cold in a day or two after the likely to heal, so this is not able to conclude that the overall disease is serious. If the body temperature reaches such a high level, it is not only the common cold, but also other diseases, such as epidemic hemorrhagic fever, scrub typhus, and other infections, and relevant tests should be conducted to exclude the common more serious diseases. It is not until the patient’s temperature returns to normal, at which point the illness is over, that it is possible to determine whether the illness is serious or not.