Sinusitis can cause nosebleeds, but not often. Sinusitis, especially acute sinusitis, can present symptoms of nosebleeds. Acute maxillary sinusitis can sometimes be mixed with blood in the nasal mucus or the patient is conscious of a fishy odor in the nasal mucus. Acute maxillary sinusitis caused by hemolytic streptococcus tends to cause nosebleeds, or even more bleeding, but rare. Infection control is the mainstay of treatment and can be treated with cephalosporins such as cefuroxime and cefaclor as recommended by the doctor. At the same time, short-term nasal vasoconstrictors can be used, clinically, the main ephedrine nasal drops and hydroxymetazoline nasal drops, etc., but long-term use is not recommended, and children are not recommended to use. If the bleeding is large, you should go to the otolaryngology department of the hospital in time for nasal endoscopy, treatment and medication under the guidance of the doctor.