Rhinitis always attacks at night, clinically there are mainly the following reasons: 1, the patient in the evening when the parasympathetic excitability increases, sympathetic excitability decreases, resulting in the patient’s nasal mucosa, nasal turbinate vasodilatation is very obvious, which leads to the lower turbinate nasal mucosa has more blood, so that the turbinate appears to be enlarged. There is more inflammatory exudation on the surface of the nasal cavity, and a large amount of nasal mucus appears, thus aggravating nasal congestion, so the patient’s rhinitis attack at night is more obvious. 2, because at night, the surrounding outside temperature drops, the patient also has a drop in body temperature, the nasal mucosa is very sensitive to temperature changes, once there is a drop in temperature or cold stimulation, it will be easy to trigger the patient to appear nasal mucosal congestion, mucosal swelling, and the patient will have to pay attention to the temperature of the mucosa. Mucosal surface inflammatory exudation and other related changes. So the night is the high incidence of rhinitis, patients should take precautions at night, pay attention to keep warm.