Adults with colds and recurrent fever may be related to viral infections, lung infections, tuberculosis and other causes. 1. Viral infection: it is the most important reason, colds are caused by viral infections. Antiviral treatment is generally not provided for common colds, while people with relatively poor immunity may have recurrent fever due to viral influence. In addition, it is necessary to clarify whether it is influenza virus infection, if it is influenza, you need to follow the doctor’s instructions to use oseltamivir antiviral treatment. 2. Lung infections: Colds can be combined with or secondary to lung infections, including bacterial, fungal, viral pneumonia, etc. Recurrent fever can occur due to lung infections if targeted anti-infective treatments are not taken in a timely manner. 3. Tuberculosis: Tuberculosis can cause cough, sputum, recurrent fever and other symptoms, which are often masked by cold symptoms. Therefore, if you have a cold and recurrent fever, and the anti-flu treatment is ineffective, you need to consider whether there is a possibility of combining with tuberculosis and other diseases. The specific cause of the disease needs to be clarified after medical examination, and at the same time follow the doctor’s instructions for treatment.