Light therapy could replace opioids as main treatment for cancer treatment side effect -- ScienceDailyLight therapies have existed for decades, but improvements in the technology have made the treatment more affordable for wider use. At a high power, light, often in the form of a laser, is used in medicine to cut or destroy tissue. But at a low power, it has the ability to relieve pain or inflammation and promote healing. The treatment is rising in use across Europe, Brazil, India, Canada and several other nations. The findings provide an upgrade to previous guidelines published in 2013, which noted the effectiveness of light therapy and recommended, based on relatively limited evidence at that time, the intervention as an optional therapy in specific cancer patient populations and settings.