Capillary rupture may be caused by trauma, oxygen deprivation, blood diseases and other reasons. 1. Trauma: Because capillaries are relatively fragile, when patients suffer from trauma, such as bumping, impact, etc., it may also lead to capillary rupture. 2. Hypoxia: hypoxia may also lead to capillary rupture, if the patient is in the thin air plateau environment for a long time, the capillaries may have been in a state of hypoxia, which leads to a decline in vasoconstriction function, causing capillary rupture. 3. Blood diseases: patients who suffer from blood diseases may also lead to capillary rupture, such as aplastic anemia, hemophilia, etc., capillary elasticity will be reduced, thus causing capillary rupture. The capillary rupture caused by more cases, the patient if the symptoms are more serious, should also go to the hospital in a timely manner, so as not to delay the condition.