Very few complications have been observed. Potential problems include deep vein thrombosis, deep vein trauma, skin burns, nerve injuries and laser eye injuries. In practice, these are all very rare or have never yet been reported. See our risks page for more details.
A problem common to all interventional radiological procedures is that it occasionally proves impossible to access the vein, and the procedure therefore needs to be cancelled and rescheduled. This is a nuisance, but it does not result in any lasting damage. Due to our experience spanning almost two decades, it is very unlikely in our hands, and you would never be charged for the repeat procedure. (Clinics with little experience are quite likely to have to abandon the procedure and bring you back a second time.)