The reason why the fever of a viral cold does not go down may be due to the combination of a bacterial infection, or the progression of the disease and the development of pneumonia, or it may not be a cold disease, and so on. 1. Combined with bacterial infection: usually after combined with bacterial infection, simple antiviral drug treatment is ineffective, so the fever will not go down. If there are symptoms such as coughing up yellow sputum, flowing yellow snot, or the blood routine suggests that the neutrophils are high, then there is a basis for bacterial infection, and antibiotics such as cefixime, azithromycin and other anti-infective treatment can be given. 2. Complications: If the fever does not go down, and at the same time there are symptoms such as coughing, coughing up sputum, chest pain, etc., it is necessary to improve the chest CT and other tests to clarify whether there is pneumonia. 3. Other diseases that cause fever not to go down: such as viral meningitis, the onset of the disease will have symptoms similar to the flu, such as fever, headache, etc., easy to be mistaken for a cold. Viral meningitis usually has symptoms such as meningeal irritation, which can be differentiated from viral colds. There are many causes of fever that do not go away, and it may also be caused by lymphoma, autoimmune diseases, and so on. If the fever is recurrent, it is recommended that the patient should consult the doctor in time, improve the examination, clarify the cause of the disease, and standardize the treatment under the guidance of the doctor, so as to avoid delaying the condition.