Low level laser has been used for almost 20 years for the treatment of lymphoedema. While not a miracle treatment and one which seems best used in conjunction with other treatments, over a number of trials it has been shown to provide significant subjective and objective benefit for those with lymphoedema who have some level of fibrotic induration either through the surgical or radiotherapeutic scarring or just the progression of lymphoedema. Fibrosis is a key inhibitor of lymphatic regeneration and lymphatic function and its removal can help improve these processes. While the exact mode of action remains to be clarified there appears to be both local and systemic effects. The major outcomes of lymphoedema treatment with laser include reduction in the size of the affected limb, reduction in extra-cellular fluids, softening of fibrous tissues, as well as a range of subjective improvements such as pain, tightness, heaviness, cramps, and paraesthesia (sensation of pins and needles). As with most other studies of LLLT there is still the need for more research especially regarding the potential synergy between LLL and other common lymphoedema treatments/management strategies such as lymphatic drainage, massage, bandaging and compression garments.