Bleeding from both nostrils may be related to trauma, nasal diseases, blood diseases and so on. 1. Trauma: If the nose is hit by trauma, it can lead to the rupture of capillaries in both nostrils, which can cause the two nostrils to bleed together. 2. Nasal diseases: such as mucous membrane erosion on both sides of the nasal septum can cause capillary rupture, resulting in the phenomenon of two nostrils bleeding together. 3. Blood diseases: such as thrombocytopenia, coagulation function abnormalities, etc., can appear two nostrils bleeding together. It is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor for standardized treatment, so as not to delay the condition.