Superficial vein thrombosis is a condition in which blood clots develop within the superficial veins (close to the skin surface), typically in the legs or arms.

Common risk factors for superficial vein thrombosis are varicose veins, pregnancy and up to 12 weeks postpartum, recent trauma, surgery or immobility, and cancer.

This JAMA Patient Page describes superficial vein thrombosis and its risk factors, symptoms, diagnosis, and treatments.