Sometimes people often have nose bleeding for no apparent reason, and this symptom usually occurs suddenly without warning. Generally there are many reasons for sudden nose bleeding, it may be caused by dry weather or improper nutrition, or it may be caused by disease. 1, dry weather caused by. Usually, it is easy to have nose bleeding in the spring and autumn, because the weather is very dry at this time, resulting in some rhinitis patients’ nasal mucosa or blood vessels are easily damaged, resulting in capillary rupture, causing bleeding. 2. Nutritional imbalance. Due to partial diet, dieting or infrequent consumption of fruits and vegetables, this will increase the brittleness of the small blood vessels in the nose, leading to the phenomenon of sudden bleeding from the nose. 3, the body disease caused by. In addition to the above two cases, there are also physical problems caused by the nose bleeding symptoms. For example, some infectious diseases or cardiovascular diseases, in addition to leukemia and other diseases can cause sudden nose bleeding. Usually nose bleeding does not need too much attention, but if the situation is caused by physical discomfort, then it should not be taken lightly, because it may be a manifestation of physical disease.