There are many reasons why the nose does not bleed during the day and starts to bleed at night, and the common reasons are dry air, nasal diseases and systemic diseases.
1. Dry air: the nasal mucosa has very dense, sensitive and fragile microvascular. Easily damaged rupture lead to bleeding, night parasympathetic nerve excitation, so that blood vessel expansion, coupled with the opening of air conditioning, indoor temperature is too high cause of air dryness, so the nasal mucosa is easy to damage the rupture of the bleeding, resulting in the daytime nose does not bleed at night on the beginning of the bleeding phenomenon.
2. Nasal diseases: such as nasal mucosal inflammation, nasal septum deviation, nasal and sinus tumors and other diseases, often appear nasal mucosal vasodilatation, mucosal erosion and other phenomena. At night, when sleeping on the side of the bed, the nasal congestion increases, blood circulation is slow, which will aggravate the symptoms of the original disease or even nosebleed, so it may cause the nose does not bleed during the day to start bleeding symptoms at night.
3. Systemic diseases: such as hypertension, arteriosclerosis and other systemic diseases, can often lead to increased arterial pressure, arterial compliance is reduced. Blood pressure may rise at night due to various reasons, and the arteries in the nasal cavity often rupture and nosebleeds occur.
Nose does not bleed during the day and starts to bleed at night can be seen in a variety of diseases, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, and then give targeted treatment or therapy.