Pneumonia in the elderly has certain characteristics. First, the morbidity and mortality rates are relatively high because the elderly have a poorer underlying status and poorer functional compensatory capacity of the organs, at which time immunity and resistance are affected to varying degrees and are susceptible to external pathogenic infections forming pneumonia, the treatment of which is slightly less effective than in the young. Secondly, the onset of pneumonia in the elderly is relatively insidious, and sometimes atypical clinical manifestations can occur, although the elderly can sometimes still have typical symptoms such as cough, sputum, chills and fever. However, a small number of patients may show abnormal changes in mental and emotional state, abdominal pain, diarrhea and poor appetite, which may lead to misdiagnosis. In addition, pneumonia in the elderly has many complications, which can lead to sepsis, disturbed water-electrolyte balance, respiratory failure, heart failure, shock, and even multiple organ damage, which is also an important cause of poor prognosis.