Hypothermia and hyperthermia, which belong to the gradation of fever, can be classified into four 4 degrees according to the specific value of the measured oral body temperature, which are low fever, moderate fever, high fever and ultra-high fever. The specific measured temperature value of low fever is between 37.3-38°C; while the temperature range of moderate fever is between 38.1-39°C; high fever is between 39.1-41°C; and beyond 41°C, this is called ultra-high fever. In a low fever, the patient is likely not to be particularly uncomfortable, or simply feel a mild fear of wind or cold, or a mild headache. In moderate fever, the patient is likely to have muscle aches and pains throughout the body, and may also have more pronounced weakness. In high fever, the patient may experience significant chills during the period of rising body temperature, and may also feel significant muscle aches and pains throughout the body and even bone pains during the plateau period of body temperature, and some people may also experience discomfort such as back pain. When super high fever is present, the patient’s discomfort will be more pronounced, and the symptoms of weakness will be more significant.