Cancerweed, also known as bitter sneezeweed, is a type of flowering plant that belongs to the aster family. It is often seen as a weed due to its invasiveness. Some synonyms for cancerweed include dogfennel, ditchweed, hogweed, and sneezeweed. These names are often used interchangeably to refer to the same plant, which is known for its bitter taste and ability to cause sneezing when its leaves are crushed. Although it may be considered a nuisance in some areas, cancerweed has been used for medicinal purposes in traditional Native American and Mexican medicine for centuries.