Essential oils have been used for centuries in cultures around the world in perfumes, rituals and ceremonies, and for medicinal purposes. There is evidence that the use of essential oils dates as far back as 3000 BC with the ancient Egyptian use for burial. The ancient Greeks and Romans used essential oils in perfumes and massage, as well as treating injuries. Use of essential oils can be found in the Ayurvedic medicine in India, which is used to balance the body naturally. The use of essential oils spread to China with the opening of trade routes.