Sinusitis patients with nasal bleeding causes are as follows: 1, sinusitis by inflammation leads to mucosal edema and capillary dilatation, with the gradual aggravation of the condition, the prolongation of time, capillary dilatation is becoming more and more obvious, resulting in nosebleeds; 2, due to sinusitis has a large amount of nasal secretions, daily life, often or irregularly blowing the nose, blowing the nose is easy to lead to the pressure in the nasal cavity increases, which can lead to the rupture of the capillaries and bleeding. The amount of nasal bleeding is not much, sometimes there is blood in the nasal mucus, and sometimes blood drips from the nasal cavity. At this time, you must go to the ENT department of a specialized hospital for a professional examination to rule out any other problems.