The causes of hair fever and weakness are as follows: First, external factors, generally after catching a cold, people will have upper respiratory tract infections, increased body temperature, manifested as hair fever, weakness, increased body temperature, this situation can be oral antipyretic, analgesic, if necessary, oral medication for upper respiratory tract infections. Second, endocrine disorders, due to changes in hormone levels in the body of menopausal women, there will be discomfort around the body, manifested as hair fever, dizziness, normal body temperature, can also be accompanied by weakness, poor sleep, etc. It is recommended to adjust the endocrine disorders mainly, if necessary, oral medication to improve the endocrine. Third, central infectious diseases, such as encephalitis, meningitis, etc.. Patients with fever and weakness may also have severe headache, and other symptoms of neurological deficits such as limb weakness and paralysis may occur in severe cases, requiring consultation with neurology.