Feverfew, also known as Tanacetum parthenium, is a perennial herb native to Europe and Asia. The leaves of the plant are used for medicinal purposes. Feverfew has been traditionally used to help alleviate headaches and migraines and to help reduce fever. It is believed to have anti-inflammatory and analgesic properties. It is also traditionally used to help reduce symptoms of rheumatoid arthritis, and it is believed to have anti-inflammatory properties that may help to reduce pain and inflammation. Feverfew is also traditionally used to help reduce symptoms of allergies and to help improve overall immune function.