Yarrow (Achillea millefolium) has a long history of use in traditional medicine, including applications for various gastrointestinal complaints. In Western herbalism and some folk traditions, yarrow was used for hemorrhoids and diarrhea, indirectly supporting the rectum as part of the lower digestive tract. Historical references suggest topical application of yarrow poultices or infusions to relieve hemorrhoidal discomfort, likely due to its reputed astringent and anti-inflammatory properties. However, the evidence for these uses is primarily anecdotal and based on centuries-old herbal texts and ethnobotanical records rather than rigorous clinical studies.

Modern scientific research on yarrow has explored its anti-inflammatory, antispasmodic, and wound-healing properties, but there is a lack of direct studies evaluating its efficacy specifically for rectal conditions or for supporting the rectum as a body system. No robust clinical trials have demonstrated its effectiveness for hemorrhoids, rectal inflammation, or other rectal disorders. As a result, yarrow’s reputation for supporting rectal health remains rooted in tradition rather than validated by scientific evidence.

In summary, while yarrow has traditional uses related to rectal health, such as for hemorrhoids, the strength of evidence is weak, and scientific validation is lacking.