37.7 ℃ has not subsided fever may be due to uncontrolled infection, primary hypothermia, skin lesions, non-infectious hypothermia, psychological reasons and other factors. 1. Fever caused by uncontrolled infection: such as virus, bacteria, mycoplasma, fungi, parasites and other pathogens caused by the infection, in the case of the infection has not yet completely subsided or from acute subacute to chronic infection, will cause persistent low fever. 2. Fever caused by vegetative nerve dysfunction belongs to primary hypothermia, which usually lasts for several months or even years, and manifests itself as regular fever, with temperature fluctuating within 0.5℃. 3. extensive dermatitis, ichthyosis and other skin lesions: due to the wide range of lesions, heat dissipation is reduced and caused by fever, resulting in 37.7 ℃ has been the phenomenon of fever. 4. Non-infectious low fever, including hyperthyroidism, rheumatic fever, lupus erythematosus, hematological diseases, tumors, drug fever, etc., will appear 37.7 ℃ has not subsided. 5. Emotional instability, excessive tension and other psychosomatic reasons can also cause disorders of central thermoregulation, resulting in unexplained low fever. If the symptoms of 37.7 ℃ has not subsided, you should go to the hospital in time for examination and treatment under the guidance of the doctor.