Water Plantain (Alisma plantago-aquatica) has a long history of use in traditional herbal medicine, particularly in Chinese and European herbal practices. In Traditional Chinese Medicine (TCM), the dried rhizome of Water Plantain, known as "Ze Xie," is commonly used to promote urination and resolve dampness, which is often associated with swelling and edema. Within TCM frameworks, swollen lymph glands may be interpreted as a manifestation of "dampness" or stagnation, and Water Plantain is sometimes included in formulas targeting such symptoms. European herbalists have also used Water Plantain for its purported diuretic and anti-inflammatory properties, which could theoretically contribute to reducing swelling in lymphatic tissues. However, there is minimal scientific research specifically investigating Water Plantain's effects on swollen lymph glands or its direct action on lymphatic tissue. Most modern pharmacological studies focus on its diuretic, anti-inflammatory, and lipid-lowering activities, but these do not directly validate its use for lymphatic swelling. Therefore, its use for supporting or treating swollen glands is primarily rooted in traditional practice rather than robust clinical or laboratory evidence. The rating of 2 reflects a consistent tradition of use with limited but plausible mechanistic support, yet lacking direct scientific validation for this specific indication.