The root spice ginger could prove to be as effective as common painkillers in the treatment of arthritis, according to scientists at the University of Miami Medical School . Rheumatologist Professor Ray Altman led a clinical trial into pain reduction through pills containing ginger. The study involved 250 people suffering moderate to severe pain through osteoarthritis, the most common form of arthritis. Over the course of six weeks, the participants were given either a placebo or a 255mg dose of ginger twice daily.