Causes of nosebleeds in summer are as follows: 1, summer is hotter and drier, resulting in vasodilatation, thinning and brittle vascular mucosa and vessel walls, reduced toughness, and nosebleeds caused by rupture of blood vessels; 2, capillary dilation, a genetic disease, the frequency of nosebleeds is higher in summer, and can be naturally relieved in autumn and winter; 3, long-term stimulation of smoking and alcohol will lead to a gradual reduction in vascular elasticity and toughness, and the body’s resistance to The ability of vasodilatation and dryness will be reduced, so the nosebleeds of smokers and drinkers in summer can be significantly increased; 4, combined with bleeding disorders or hypertension, the body’s resistance to heat and dryness is reduced, resulting in easy nosebleeds in summer. Therefore, after correctly understanding nosebleeds in summer, reducing bad habits as much as possible, or ensuring that the original disease is not in an active state and acute phase, can reduce the chances of nosebleeds in summer to a certain extent.