According to Ellingwood the following “ . . .indications will guide in the selection of this remedy: Hot, dry burning skin, at the beginning of acute asthenic fevers, with suppressed secretion; deficient renal action, with vesical renal or urethral irritation; acute or chronic Bright's disease in its incipient stage. Leucorrhea, with relaxed vaginal walls. Menorrhagia and amenorrhea; hemorrhoids, with bloody discharge, atonic gastric and intestinal dyspepsia; passive hemorrhages.
Warnings/Caution
Contraindications: In large doses yarrow is a uterine stimulant and therefore both tea and tincture should be avoided during pregnancy. It can be used during pregnancy as a flower essence or diluted in a homeopathic way 1 - 12 x. The essential oil is contraindicated in pregnancy.
Toxicity: There is no indication of toxicity for internal use in reference reviews. Some people have a skin sensitivity especially with over consumption. Photosensitivity has also been noticed.