The recurrence of lung abscess is mainly due to the presence of lung abscess before, and the condition can be slowly reduced until cured in about 2 weeks by using sensitive and effective antibiotic treatment. Due to the decline of the patient’s resistance and lack of attention to follow-up care, septic bacteria invade the respiratory tract again and lung abscesses reappear in the lungs. At this time, the patient will have obvious symptoms, such as sudden increase of body temperature, coughing, coughing up large amount of pus sputum, accompanied by hemoptysis, chest pain, chest tightness, and even shortness of breath, which may be accompanied by emaciation, weakness, depression, and loss of appetite. These symptoms suggest a recurrence of lung abscess.