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Ginger (Zingiber officinale) is a plant native to Asia. The ginger spice comes from the roots of the plant. It's used as a food flavoring and medicine.
Ginger contains chemicals that might reduce nausea and swelling. These chemicals seem to work in the stomach and intestines, but they might also help the brain and nervous system to control nausea.
People commonly use ginger for menstrual cramps, osteoarthritis, and morning sickness. It is also used for diabetes, motion sickness, and many other conditions, but there is no good scientific evidence to support most of these uses. There is also no good evidence to support using ginger for COVID-19.
