Cold and flu patients with recurring fever back again and again to consider with their own immunity is poor, do not pay attention to warmth and other factors, and secondary acute sinusitis, bronchopneumonia, etc. Related. 1. Poor immunity, do not pay attention to warmth: If the upper respiratory tract infection patients with low immunity, do not pay attention to warmth during the illness, the body will continue to replicate the virus, induced by the aggravation of the condition or recurring, can be manifested as a recurrent fever fever and then fever. 2. secondary acute sinusitis: when the upper respiratory tract infection patients in the body of pathogens to the sinus parts of the diffusion, induced acute sinusitis, some patients can be manifested as increased nasal purulent secretion, dizziness, headache, fever, etc., can also be manifested as a recurring fever and fever. 3. Secondary bronchopneumonia: some patients will be aggravated secondary bronchopneumonia, the disease can also cause some patients with repeated fever and fever, and chills, cough, cough, sputum, shortness of breath, loss of appetite and other symptoms. In addition, when patients with upper respiratory tract infections secondary or combined with myocarditis, otitis media, rheumatoid arthritis, systemic lupus erythematosus and other diseases, can also be manifested as recurrent fever and fever, it is recommended to consult a doctor in a timely manner.