Yarrow is an herb. The above ground parts are used to make medicine. Yarrow is used for fever, common cold, hay fever, absence of menstruation, dysentery, diarrhea, loss of appetite, gastrointestinal (GI) tract discomfort, and to induce sweating. Some people chew the fresh leaves to relieve toothache. It is helpful in relieving fevers, shortening the duration of cold and flu, helping improve relaxation during illness, and relieving cramps associated with hormones or illness. Applied topically, it supports healthy skin as it is helpful with skin itching, rash or other issues. An external tincture or poultice will often help with hemorrhoids, rashes and broken skin. Some people will notice relief from allergy symptoms by drinking a tea of yarrow and mint. Since it is helpful in stopping bleeding and avoiding infection, poultices of yarrow and plantain can be helpful on wounds.