Mycoplasma pneumonia has been well for a week and then began to fever first should look for the cause, the possible causes are not enough treatment, improper use of medication, combined with other infections, etc., for different reasons there are different ways to solve the problem. 1. Insufficient treatment: Mycoplasma pneumonia treatment time is longer than general bacterial pneumonia, usually two weeks. Patients with mycoplasma pneumonia for a week is likely to only use the drug for a week the disease has been temporarily controlled, but the patient’s autonomy to stop the drug leading to recurrence of pneumonia, at this time should continue to use the drug in accordance with the course of treatment. 2. Improper medication: Mycoplasma pneumonia is a mycoplasma infection caused by pneumonia, mycoplasma has no cell wall, between bacteria and viruses, conventional penicillin and other antibiotic drugs are ineffective against it. Preferred macrolides such as azithromycin or quinolones such as levofloxacin. However, quinolones are contraindicated in adolescents under 18 years of age. 3. Combined with other infections: after mycoplasma pneumonia infection, the patient’s immunity is reduced, the body is in a weaker state, it is easy to be invaded by pathogens, and fever symptoms will appear after infection. At this time, the pathogen of the infection should be clearly defined, according to the pathogen to choose the appropriate drugs for further treatment. After mycoplasma infection, patients should follow the doctor’s instructions, take medication on time, and regularly monitor all vital signs, and immediately go to the hospital when there is any discomfort to avoid adverse consequences.