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.
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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.)