Cold and flu nose out of the air is very hot is mostly normal phenomenon, mostly related to the cold and flu caused by the body heat, resulting in the nose out of the air is very hot. The role of the nasal cavity in normal people is to warm and humidify the inhaled gas. Therefore, under normal circumstances, the temperature of the gas exhaled from the nose is generally the same as the body temperature, and you may not feel the heat. However, when a fever occurs in a cold, it will cause the body’s temperature to increase, in which case, when the gas enters the nasal cavity, it will make the temperature of the gas exhaled from the nose higher than the normal temperature, and you may feel that the gas exhaled from the nose is hot. Therefore, when the cold fever, the nose out of hot air generally do not need to worry too much, but if the symptoms failed to improve or even gradually aggravated, need to be promptly consulted in the regular hospital, with the doctor to improve the examination, standardized treatment.