Ginger is used mainly to treat nausea, upset stomach, and other stomach issues. Ginger reduces nausea through a direct effect on the stomach rather than on the central nervous system.
There are conflicting reports about whether ginger increases the speed of stomach emptying. A large study showed it had no effect. But it increases movement of the rest of the gastrointestinal system.
Ginger has been used to treat nausea due to mild gastrointestinal infections and pregnancy. It also treats nausea due to vertigo, nausea after surgery, and vomiting from chemotherapy. Studies show mixed results for these effects. But research shows that ginger is safe and effective for pregnancy-related nausea, such as morning sickness. These effects are due to the gingerols.
Ginger also contains shogaol. This aids in pain relief and decreases inflammation.