Lower respiratory tract infections include acute bronchitis, chronic bronchitis, pneumonia, lung abscess, bronchodilatation with infection, pulmonary fibrosis with infection, accompanied by a significant increase in blood count, total white blood cells, and neutrophils. Clinically, antibiotics should be given for anti-infection treatment, antibiotics include penicillins, cephalosporins, fluoroquinolones, macrolide antibiotics. Penicillins include amoxicillin, cephalosporins include cefuroxime, cefprozil, second-generation cephalosporins, fluoroquinolones include ofloxacin, levofloxacin, moxifloxacin orally, and macrolides include azithromycin, roxithromycin, and erythromycin succinate. All of these antibiotics can control the infection in the lower respiratory tract as soon as possible and relieve symptoms such as coughing, coughing up sputum, chest pain, or even blood in the sputum and fever, and should be used as early as possible to shorten the course of the disease.