Nosebleed fever can be seen in many diseases, such as acute rhinitis, leukemia and nasopharyngeal cancer. 1. Acute rhinitis: If the patient has acute rhinitis, a large number of viruses and bacteria will invade the body in a short period of time and cause the symptoms of body immunity fever. Nasal mucosa is congested and swollen, mucosal fragility increases, capillary dilatation, under the stimulation of inflammatory factors and external impact can make nasal mucosa and blood vessels broken, oozing blood or bleeding occurs. 2. Leukemia: leukemia can be divided into acute and chronic. Acute patients will show sudden high fever, severe bleeding and so on; chronic patients have no obvious abnormality, and will show symptoms such as excessive sweating, low fever, bleeding and so on only when the disease develops to the late stage. 3. Nasopharyngeal cancer: if the patient is malignant nasopharyngeal cancer or advanced nasopharyngeal cancer, and the cancer spreads to a large area in the body, it can cause fever and nosebleed. If the patient has fever and nosebleed, he/she should go to the local hospital in time for clear diagnosis and early treatment.