What are the signs and symptoms of superficial thrombophlebitis?
Blood clots in the superficial vein system most often occur due to trauma to the vein which causes a small blood clot to form. Inflammation of the vein and surrounding skin causes the symptoms similar to any other type of inflammation including
- tenderness, and
Often the affected vein can be palpated (felt) as a firm, thickened cord. There may be inflammation that follows the course of part of the vein.
Although there is inflammation, there is no infection.
Varicosities can predispose to superficial thrombophlebitis and varicose veins. This occurs when the valves of the larger veins in the superficial system fail (the greater and lesser saphenous veins), allowing blood to back up and cause the veins to swell and become distorted or tortuous. The valves fail when veins lose their elasticity and stretch. This can be due to age, prolonged standing, obesity, pregnancy, and genetic factors.