Wintergreen essential oil is traditionally derived from the wintergreen plant. There are two species that can be used to produce the oil: Gaultheria procumbens (native to North America) and Gaultheria fragrantissima (native to Asia and India). You may also see the wintergreen plant locally referred to as checkerberry or teaberry. Wintergreen leaf is used for painful conditions including headache, nerve pain (particularly sciatica), arthritis, ovarian pain, and menstrual cramps. It is also used for digestion problems including stomachache and gas (flatulence); lung conditions including asthma and pleurisy; pain and swelling (inflammation); fever; and kidney problems.