The claim that people with blood type O are prone to pneumonia is wrong and lacks scientific basis, and is generally related to autoimmunity and environment. 1. The so-called O-type blood is prone to pneumonia is wrong, there is no authoritative literature or clinical case statistics, can prove that O-type blood is prone to pneumonia. At the same time, the occurrence of pneumonia and their own blood type correlation is small, and does not because of a certain blood type will be more susceptible to infection. 2. Pneumonia is mainly related to one’s own immunity and environment. People with poor immunity are more susceptible to bacterial and viral infections and pneumonia; people who have been in the hospital for a long period of time are more susceptible to infections in environments with more pathogenic bacteria. Therefore, it is recommended to consult a doctor in time for the occurrence of pneumonia, subject to the doctor’s opinion, and not to believe rumors.