The outflow of blood streaks during nosebleeds is mainly due to the fact that after the rupture of blood vessels, the outflow of blood, after leaving the blood vessels, forms thrombotic substances under the nasal cavity shaping, and this red thrombus is mainly composed of fibrin scaffolds and red blood cells. This condition usually has no excessive effect on the human body, and sometimes there is a feeling of breathlessness because of blocking the nasal cavity. Nosebleeds are a common phenomenon in daily life and include the following causes: 1. Anatomical abnormalities and deviations of the nasal septum and anatomical abnormalities of the blood vessels in the nasal ventricle area: bleeding caused by the rupture of local capillaries after minor injuries or cold and flu. When patients have nosebleeds, they do not need to be overly nervous, but should go to the ENT department of the hospital in time to see if there are anatomical abnormalities; 2, thrombocytopenia or medical diseases: such as leukemia leading to coagulation dysfunction, which in turn leads to nosebleed symptoms; 3, dry air or snoring at night: this can lead to increased local vascular fragility, resulting in nosebleeds. Therefore, there is no need for patients to panic after the appearance of blood streaks during nosebleeds, which is a phenomenon of coagulation after the outflow of blood.