Why is there a rupture of small blood vessels in general? Most commonly, these processes are manifested by nosebleeds☝🏻 So, the rupture of small vessels is more frequent when the elasticity of its wall is reduced. This happens with hypertension, atherosclerosis, diabetes mellitus, or even with the common hypovitaminosis due to impaired nutrition of the wall. Then the vessel cannot withstand the normal blood pressure and can burst even under the slightest load.