The most common clinical cause of fever and muscle pain is the cold. Because the metabolic level of enzymes in the body will change after a fever, the anaerobic metabolism of the muscles will increase, so it is possible that more lactic acid will accumulate in the muscles and this pain will occur. If the body temperature exceeds 38.5℃, in addition to drinking more water and carrying out the necessary physical cooling, you can also take oral non-steroidal antipyretic drugs, such as acetaminophen and ibuprofen, to reduce fever, and as soon as the fever subsides, the muscle pain will slowly The muscle pain will be relieved as soon as the fever subsides. For further clarification of the cause of the fever, it is recommended to go to the hospital for further examination.