Pneumonia chest pain after infusion is considered to be related to the disease has not subsided, intercostal muscle fatigue, pleural lesions, and other reasons. 1. The disease has not subsided: pneumonia still has chest pain after infusion, it is considered that the inflammation of the lungs has not been absorbed, and the stimulation of the pleura by the inflammation persists, so there is still chest pain. 2. Intercostal muscle fatigue: pneumonia will have obvious coughing, coughing will lead to spasm or fatigue of intercostal muscles and diaphragm, so when the chest pain still occurs after infusion treatment. 3. Pleural lesions: when pneumonia is complicated by pleural lesions, such as pleural cavity effusion, pleural adhesion, pleural thickening, etc., so it will still cause chest pain after infusion treatment. 4. Other causes: chest pain after pneumonia infusion is still felt, not necessarily due to pneumonia, it may be caused by other reasons, such as intercostal neuralgia, herpes zoster, angina, etc.. Pneumonia infusion will still have chest pain need to go to the hospital in time to check the specific causes and treatment, so as not to delay the condition.