Nymphaea nouchali, commonly known as the blue lotus or star lotus, has a long history of use in traditional medicine systems, particularly in South and Southeast Asia. In some Ayurvedic and Unani medicinal texts and folk practices, various parts of the plant (such as roots, flowers, and rhizomes) have been used for their purported astringent, anti-inflammatory, and soothing properties. These traditional uses have included applications for conditions involving bleeding, inflammation, and irritation, such as hemorrhoids. The rationale is based on the plant’s supposed ability to reduce swelling and soothe mucous membranes.

However, there is a lack of robust scientific evidence to support these traditional claims. Very few, if any, peer-reviewed clinical studies specifically investigate the efficacy of Nymphaea nouchali for hemorrhoids. Most available information is anecdotal or based on ethnobotanical surveys rather than controlled scientific trials. Some phytochemical analyses suggest the presence of flavonoids, tannins, and other compounds with potential anti-inflammatory or astringent effects, but direct correlation with hemorrhoid treatment remains unproven.

In summary, the use of Nymphaea nouchali for hemorrhoids is mainly justified by traditional herbal medicine, with minimal scientific validation at this time.