Wormwood is an herb. The above-ground plant parts and oil are used for medicine. Wormwood is used for various digestion problems such as loss of appetite, upset stomach, gall bladder disease, and intestinal spasms. Wormwood is also used to treat fever, liver disease, and worm infections; to increase sexual desire; as a tonic; and to stimulate sweating. The azulenes in the plant are anti-inflammatory and reduce fevers, and the plant was used in ancient times as an emmenagogue, but is no longer used that way, and should be avoided in pregnancy. Small doses of wormwood tea taken before meals can stimulate digestion and prevent heartburn and gas, and even boost energy. It is also noted as being useful in alleviating fever, expelling parasitic worms like roundworm from the digestive tract, and for its tonic effects. It may also be applied topically to reduce inflammation of insect bites and promote healing. Wormwood is also noted to be useful in treating jaundice, a sign of liver dysfunction.