William Ring23 Nov, 2020Health
If you are wondering, what causes spider veins? We have an answer Veins are the blood vessels that take de-oxygenated blood back to the source AKA heart. The blood which circulates through them is beneath less pressure than vessels more confined to the heart, so the walls are not so thick than comparatively to the arteries. They also have valves at continuous intervals to restrict the blood from flowing the wrong way, and to aid venous return (the blood flow posterior to the heart). If these valves grow faulty, then the blood can flow backward and accumulate.
 
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