Patients with pneumonia can have a high fever or a low fever. If the patient’s immune system is strong, he or she may have a high fever. If the patient’s immune function is weak, he/she can have a low fever or no fever symptoms, such as patients with AIDS, the elderly, and patients taking hormones for a long time. Whether the fever is high or low, we need to actively seek medical treatment, improve the blood routine, C-reactive protein, chest X-ray, sputum culture and other related examinations, according to the results of the examination, to assess the possible infection of the causative organisms, and according to the causative organisms to take appropriate treatment. If it is a bacterial infection, we can use antibiotics for treatment, commonly used antibiotics include cefixime, amoxicillin, azithromycin, levofloxacin and so on. If the patient has a viral infection, we need to use antiviral drugs, such as Abidol, Oseltamivir and so on. If the patient has Mycoplasma pneumonia, antibiotics from the macrolide group, such as azithromycin, erythromycin, or quinolone antibiotics, such as levofloxacin and moxifloxacin, are needed.