Several studies have examined ginger’s nausea-relieving properties. Results have been mixed: There is some evidence that ginger is effective in treating motion sickness, and nausea caused by other drugs or anesthesia. [Br J Anaesth 2000;84(3):367] Ginger has also been studied to see if it helped women with severe nausea during pregnancy; several small studies suggested it was indeed effective.
An uncontrolled study of the effect of ginger on arthritis and muscle pain showed that all patients with musculoskeletal pain found relief, and three-fourths of those with rheumatoid arthritis or osteoarthritis also saw a decrease in pain and swelling [Med Hypotheses 1992 Dec;39(4):342]
(Source: Natural Treatments for Fibromyalgia: An A to Z Guide, by Kenna Simmons. An official publication of the Arthritis Foundation. To purchase, visit www.arthritis.org.)