Yarrow's astringent property contracts mucous membranes and blood vessels and is useful in preventing hemorrhages. High in silica, yarrow promotes tissue repair. It actively enhances the healing of cuts, burns, ulcers and inflammatory skin conditions. Inflamed conditions such as gastritis, enteritis and diarrhea respond well to yarrow's anti-inflammatory properties. Any bleeding that may accompany these condition's is curbed by yarrow's astringent action. Because yarrow promotes sweating is helps clear the body of excess heat and toxins. While not a tonic herb, yarrow does have an effect on toning the cardiovascular system. Yarrow dilates vessels and therefore reduces blood pressure, improves varicose veins, hemorrhoids, phlebitis, and thrombosis. Urinary tract infections, irritable bladder and cystitis are aided by yarrow's diuretic action. By increasing the elimination of fluid and toxins through the urinary system, yarrow is useful in clearing gravel or urinary stones. Yarrow contain sterols that promote the creation of progesterone. This property can help to regulate the menstrual cycle. Yarrow can reduce uterine congestion and prevent flooding which can occur during menopause. One herbalist offers the observation that yarrow is excellent for tough, independent women who don't talk about their problems. Yarrow should be avoided during pregnancy.