Nosebleeds can be caused by fever. Fever may lead to congestion of the nasal mucosa and excessive dilatation of submucosal blood vessels, and the patient may also experience dryness of the nasal mucosa, which may further lead to localized mucosal erosion, ulceration and bleeding. When the patient has fever, it is often caused by respiratory tract bacterial or viral infections, which may further lead to excessive congestion and dryness of the local mucosa of the nasal cavity, easily inducing submucosal vasodilatation and leading to symptoms of nosebleeds. Nasal endoscopy can be used to further find out the specific location and cause of the nosebleed and take effective measures to stop the bleeding.