Stress reaction refers to the reaction process in which various stimuli and pressures act on individuals, disrupting their original physiological and psychological balance and stability, and individuals strive to maintain this stability. In the face of COVID-19 epidemic, people often have various stress reactions due to the threat of virus to life, various realistic survival pressures and the inadaptability caused by the change of behavior habits, but the degree and manifestations of the reactions vary from person to person. But you must wear a mask in public. Not wearing it will endanger public safety.