Coughing all the time even after the new crown conversion may be caused by post-infectious cough, allergy, environment and other reasons. 1. Post-infection cough: after the patient has experienced a lung infection, the trachea and bronchial tubes of the lungs have been damaged to a certain extent, and have not fully recovered within a short period of time, so it is possible to have a transient airway hyperreactivity, which may result in coughing all the time. 2. Allergy: When the patient encounters allergic gases and substances, which cause some stimulation to the mucous membrane of the larynx, the patient will cough all the time. 3. Environment: the environment where the patient lives has more dust, smoke, chemical substances, etc. Due to the interaction between external factors and their own factors, it will cause some stimulation to the larynx, which will result in coughing all the time. It is recommended to go to the hospital for examination, the doctor will give appropriate advice based on clinical symptoms, identify the causes of timely diagnosis, targeted treatment.