Hot air coming out of the nose may be caused by low ambient temperature, fever, rhinitis and other factors. 1. Low ambient temperature: When the ambient temperature is relatively low and the temperature of the nasal cavity is higher than the outside temperature, you will feel hot air coming out of your nose when you breathe. 2. Fever: bacteria, viruses and other pathogenic microorganisms infecting the body may lead to symptoms of fever, the body temperature is relatively high, the temperature of the exhaled gas is also relatively high, the patient will appear in the nose out of the heat of the symptoms. 3. Rhinitis: Rhinitis may be caused by pathogenic microbial infections, allergens and other factors, the patient will experience symptoms such as dryness in the nose, burning sensation of breathing, and may also experience nasal congestion, runny nose and other symptoms. Hot air out of the nose may also be caused by colds, sinusitis and other factors, it is recommended that patients seek timely treatment.