The main differences between novel coronavirus pneumonia and natural and man-made disasters are the following: 1. duration and scope of impact: natural and man-made disasters usually occur suddenly and end suddenly, affecting a narrow range of people and a relatively short duration; novel coronavirus pneumonia affects not only the Wuhan area, not only China, but also the whole world, with a wide scope of impact. And because no controllable factors have been found, the epidemic lasts for a long time; 2. Pathological manifestations, symptom manifestations: natural and man-made disasters are more transient traumatic manifestations due to sudden occurrence; the epidemic involves a large area and is a chronic disease. So there are more anxiety and worrying symptoms. For example, some people have chest tightness and worry whether they are pneumonia, and they panic all day long about it; some people are afraid that they have pneumonia, and they are overly defensive, afraid to go out, and they wash excessively, wipe, and wash their hands repeatedly at home, which are very excessive and do not fit the environment and area they are in. Content source: Dr. You Lai