Severe pneumonia complicated by respiratory failure is very common in clinical practice, and whether it can be cured varies from person to person. If the patient is a young person without underlying disease, the lungs and other organs will recover faster after active treatment and will not leave sequelae; if the patient is older and has low resistance, the course of treatment is generally longer and the lesions are absorbed slowly, leaving scar tissue and cannot be completely cured.1. It can be cured: Treatment of severe pneumonia should first identify the cause, such as bacterial infection or viral infection, and active anti-infection treatment. At the same time to keep the respiratory tract unobstructed, appropriate suction, nebulized inhalation, and give reasonable oxygen therapy and nutritional support, most can achieve clinical cure; 2, difficult to cure: If the infection is not actively controlled, severe pneumonia may lead to respiratory failure, producing severe hypoxia, and failure to timely tracheal intubation, tracheotomy caused by insufficient oxygen supply, will lead to the patient’s blood pressure drop, arrhythmia, endangering the patient’s life. In addition, if there is a combination of advanced age and chronic lung disease, chronic liver disease, chronic kidney disease or diabetes, it may be more difficult to cure and may easily lead to death caused by infectious shock and multiple organ failure. When a patient is diagnosed with severe pneumonia, he or she usually needs to be admitted to an ICU for full monitoring of the condition. Since severe pneumonia is often caused by infection, patients need targeted anti-infective treatment, such as taking sensitive antibiotic drugs, under the guidance of a medical professional. Patients need to keep their airways open, and if hypoxemia and hypercapnia are present, oxygen therapy and respiratory support need to be given. In addition, some patients have symptoms such as cough and sputum, which can be treated with medications or aspiration as appropriate to prevent adverse consequences such as infection and asphyxia.