There are two common cases of lumps in venous vessels, one is the formation of a lump-like structure in the venous vessels themselves; the other is the formation of venous thrombosis and phlebitis in the venous vessels, which resembles lumps and is therefore considered to be lumps in the venous vessels. 1. The formation of varicose veins causes local blood flow to slow down, and the formation of intravascular thrombosis induces phlebitis, which causes local redness, swelling, heat and pain, and gradually hardens to resemble bumps, so it is also considered as bumps in the veins.