After the pneumonia fever subsides, the cough may be aggravated, mostly because the pneumonia is effectively controlled and the fever gradually subsides. At this time, the ciliary movement of the bronchial mucosa of the patient can be restored, and the sputum and secretion in the airway can be discharged as much as possible through coughing, therefore, the degree of the patient’s cough will be aggravated. After the infection of pneumonia, the airway sensitivity of the patient can be significantly increased, showing high reactivity, and the degree of coughing can be significantly aggravated when stimulated by the outside world. However, it should be noted that in a few patients with obstructive pneumonia, even if the lung infection is under control and the fever has subsided, the presence of new organisms in the bronchial tubes may lead to severe coughing, which should be differentiated accordingly. Therefore, when the cough worsens after the fever of pneumonia subsides, it is necessary to promptly review the blood test, chest X-ray or CT examination to clarify the situation of lung infection, and if necessary, to provide targeted treatment.