The causes of occasional nose bleeding include inflammation, allergic factors, environmental factors, nose-digging, nose rubbing, as well as excessive fatigue, mental and emotional stress, lack of sleep, respiratory tract inflammation and infection, etc., as follows: 1, inflammation, allergic factors, environmental factors: because of nasal cavity, sinus inflammation and allergic disease factors, as well as by the surrounding air, the environment is excessively dry and there is 2, nose picking, nose rubbing: some patients may also repeatedly pick their nostrils, nose rubbing behavior, resulting in occasional nose bleeding symptoms. 3, over fatigue, mental and emotional stress, lack of sleep: some patients may intermittently exist over fatigue, mental and emotional stress, sleep deprivation and other factors. 4, over fatigue, mental and emotional stress, sleep deprivation and so on. 4, respiratory tract inflammatory infection: may be affected by respiratory tract inflammatory infection disease condition, may lead to the occurrence of occasional nose bleeding symptoms, if necessary, careful and comprehensive examination of the nose, to further clarify the cause.