Sun exposure
Roaming in the hot sun for a considerable amount of time can also cause broken capillaries. To be precise, extreme temperature cannot be tolerated by the capillaries. When a person travels in cold climatic conditions, the capillaries constrict, but on moving in the house, the temperature being relatively warm, the capillaries expand. This alternate expansion and constriction of blood vessels can harm the structure of capillaries, eventually leading to breakage.