What Causes Spider Veins?

Vein Surgery

Vein surgery can sometimes cause spider veins, if the surgery leads to the valves in the patient's veins becoming damaged or malfunctioning. Valves weakened by surgery may not be able to keep blood flowing toward the heart because they stay open instead of closing. Weak valves might also develop if the walls of the veins are weak, which can also be caused by vein surgery. Weakened vein walls aren't as elastic as they normally are, and instead resemble a rubber band that's stretched too tightly. The valve flaps separate when the vein stretches and widens, preventing the healthy flow of blood. Separated valves, which might be caused by surgery, aren't able to hold back the blood from flowing backward. The backflow causes more stretching and twisting, which then causes the veins to become twisted and large. Spider veins are often treated with vein surgery, but this surgery can also cause more to develop.

Keep reading to uncover information on more causes of spider veins now.