Nosebleeds are not contagious, but are usually caused by local factors in the nasal cavity or other systemic diseases. It is very likely that the patient often picks his/her nose, or the blood pressure increases when he/she is in strenuous activities, which leads to the rupture of blood vessels in the nasal cavity, or the patient usually has problems with blood clotting, or other hematologic diseases, which leads to nosebleeds. It is recommended that the patient should go to the hospital for detailed examination after the nosebleed occurs, to clarify the cause of the disease and to further treat the symptoms, so that the patient’s nosebleed will stop completely. Patients should avoid strenuous activities and develop good habits, do not dig the nostrils with your hands. When you go out, you can consider wearing a mask to avoid contact with irritating substances.