Geranium, particularly the species Geranium maculatum (commonly known as wild geranium or cranesbill), has a long-standing history of use in traditional herbal medicine to treat external bleeding. Native American tribes and early Western herbalists used the powdered root or astringent preparations of geranium topically to aid in stopping bleeding from cuts, wounds, and abrasions. The plant contains significant amounts of tannins, which are known for their astringent properties; these compounds can constrict tissue and blood vessels, thereby reducing bleeding and promoting clotting at the site of injury. Despite its deep roots in tradition, scientific evidence supporting the efficacy of geranium for external bleeding is limited. Most available data are derived from ethnobotanical records and anecdotal reports, rather than rigorous clinical studies. While the astringent and styptic actions of tannin-containing plants like geranium are plausible and supported by pharmacological principles, direct clinical validation is lacking. There are no large-scale, controlled trials specifically examining geranium’s effectiveness for external bleeding in humans. In summary, the use of geranium for external bleeding is justified primarily by traditional use and the known properties of its phytochemical constituents, particularly tannins. However, it should be noted that modern medical advice should be sought for significant or persistent bleeding, as evidence from scientific studies is minimal.