Varicose veins are known to affect approximately one third of the population and lead to reduced quality of life for patients. The traditional method of treatment has been surgery, but over the past decade, minimally invasive techniques have gained increasing prominence. These have been found to be easier to administer, less expensive, have shorter recovery periods and enables a more rapid return to normal activities. One such method is the use of foam sclerotherapy for the treatment of truncal incompetence and it has increased in popularity since the 1990s. Compared to surgery, the procedure is much cheaper and the recovery time is fairly rapid post-procedure. Patients have also reported improved health related quality of life afterwards. This book discusses the process involved in sclerotherapy, its potential complications and clinical outcomes.