Ginger cultivation began in South Asia and has since spread to East Africa and the Caribbean. It is sometimes called root ginger to distinguish it from other things that share the name ginger. A review of several studies has concluded that ginger is just as effective as vitamin B6 in the treatment of morning sickness. One study showed that ginger has anti-inflammatory properties and is a powerful natural painkiller. Ginger has long been used as a natural heartburn remedy. It is most often taken in the form of tea for this purpose. Research has shown that ginger may provide migraine relief due to its ability to stop prostaglandins from causing pain and inflammation in blood vessels.