There are two classifications of human veins in terms of closeness to the surface of the body: the superficial vein and the deep vein.
The superficial vein can be easily traced, unlike the deep vein which is located deep in the body.
The deep venous system is a common site for the development of blood clots (also called thrombosis) which can be a really serious condition. These clots are usually regarded to cause complications. An example of resulting disorder is Deep Vein Thrombosis (DVT).
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