Nasal congestion in the morning and evening during the day is fine, may be related to allergic rhinitis, chronic simple rhinitis, vasomotor rhinitis and other diseases. 1. Allergic rhinitis: when the disease attacks, nasal sensory nerves in a hypersensitive state, in the morning and evening under the stimulation of alternating warm and cold air, can appear nasal mucosal reactive edema, daytime environmental temperature is more constant, this effect is not obvious. This effect is not obvious in the daytime when the ambient temperature is more constant. 2. Chronic simple rhinitis: the arteries and veins in the deep layer of nasal mucosa, especially the cavernous tissue of the inferior turbinate is chronically dilated, and the nasal congestion is characterized by the reduction of nasal congestion in the daytime, in summer, during labor or exercise, and the increase of nasal congestion in the morning, in the night, during sedentary time or in the cold, which results in the situation that the nasal congestion in the morning and evening is fine in the daytime. 3. Vasomotor rhinitis: its pathogenesis is complex and difficult to diagnose. It is found to be related to autonomic dysfunction and develops as a result of an overly strong reaction to certain stimuli. In the morning and evening temperature changes, the human body nerve sensitivity increases when manifested as nasal congestion, while the daytime without the stimulation of this factor asymptomatic. If the nasal congestion in the morning and evening is fine in the daytime, and if it is recurring, it is recommended to consult a doctor and have a systematic examination to determine the cause of the problem.