Nosebleeds can occur when the weather is too hot. When the weather is too hot, it can cause the mucous membrane of the nasal cavity to be dry, and if there are bad habits such as nose picking, it can lead to localized mucous membrane erosion, rupture and bleeding, resulting in nosebleeds. Hot weather can cause capillary expansion, and the nose has a large number of capillary networks. When the weather is hot and dry, the capillary network in the nose will have blood vessel rupture leading to nasal bleeding, especially patients with dry rhinitis and deviated septum are more prone to nosebleeds. If the patient has a nosebleed, he should consult the doctor in time, and if necessary, carry out nasal endoscopy and blood system and other related examinations, so as to clarify the cause of the bleeding and the location of the bleeding at an early stage, and then treat the bleeding under the guidance of specialists.