Asparagus (Asparagus officinalis) has a long history of use in traditional medicine systems, particularly in Europe and Asia, as a remedy for edema (fluid retention). This traditional application is largely due to the vegetable's recognized diuretic properties — its ability to increase urine output. In folk medicine, asparagus was often recommended for individuals experiencing swelling, especially in the lower limbs, as a means to help the body eliminate excess fluid through urination.

The diuretic effects of asparagus are attributed to certain compounds, such as asparagine (an amino acid), and various saponins and flavonoids present in the plant. These components are believed to mildly stimulate renal function and promote the excretion of water and salts. Historical herbal texts, such as those from ancient Greek and Roman sources, reference asparagus as a beneficial plant for "clearing the urinary tract" and addressing "dropsy" (an old term for edema).

However, while these traditional uses are well-documented, the scientific evidence supporting asparagus as an effective treatment for edema is limited. Modern clinical trials specifically examining asparagus for edema are scarce, and most current references cite its diuretic action based on animal studies or anecdotal human use rather than robust clinical data. Thus, while tradition supports its use, scientific validation remains weak.