When the breath comes out hot, this is the time to mainly consider that the respiratory tract has different degrees of inflammatory reactions. For example, cold, rain, staying up late, alcoholism and other triggering factors, so that the body’s immunity is reduced, so that the invasion of viruses, bacteria and other pathogens, so that the mucosa of the respiratory tract appears more obvious congestion, edema, this time the capillaries of the airway mucosa will expand, so that the airway heat dissipation, there are different degrees of temperature increase. At this time, the air breathed through the airway will also become relatively warm, so the exhaled air will be very hot, and if the inflammatory response is strong, the patient’s body temperature may also gradually climb at any time, which will contribute to the exhaled air being even hotter. At this time, blood tests can be performed, and respiratory secretions can also be taken for pathogen culture to clarify the cause and provide timely treatment.