Double lung inflammation is usually seen in bacterial pneumonia, Mycoplasma pneumoniae or Chlamydia pneumoniae, and tuberculosis. The severity should be judged according to the infectious agent and the underlying disease. For example, double lung inflammation caused by infection with Streptococcus pneumoniae has a good prognosis without underlying disease. In the case of pneumonia caused by multi-drug resistant bacteria, untimely treatment may be life-threatening for patients with underlying disease. 1. For double lung inflammation caused by bacterial infection, sensitive antibiotics should be selected according to the infected bacteria, and as long as the antibiotics are effective, the prognosis is generally good. If the drug sensitivity results confirm that the infected bacteria are multi-resistant, the symptoms are not relieved after antibiotics are given, and the combination of underlying diseases may be life-threatening. 2. Mycoplasma pneumoniae and Chlamydia pneumoniae are self-limiting, with a course of treatment of 2-3 weeks, most of which have a good prognosis and are generally not life-threatening. 3. Inflammation of both lungs caused by tuberculosis has a good prognosis in the absence of underlying disease and drug resistance. In the case of drug-resistant TB, the cure rate will be reduced. The prognosis of double lung inflammation is different depending on the pathogen of the infection and the prognosis is also different, which requires medical treatment.