There are a few reasons why your capillaries might break easily. One reason might be that your capillaries are weak and thin. This may cause by a variety of things, such as genetics, age, hot weather, skin health or lifestyle choices. Another reason why your capillaries might break easily is because they are constantly being exposed to stressors, like UV radiation from the sun or cigarette smoke. When these stressors are present, they can damage the capillaries and make them more likely to break.