The use of "Corktree" for edema is primarily rooted in traditional medicine, particularly in East Asian herbal practices. "Corktree" commonly refers to the Phellodendron genus, especially Phellodendron amurense (Amur corktree), which is a well-known component in Traditional Chinese Medicine (TCM). In TCM, the bark (known as "Huang Bai") is used for its purported bitter, cold properties and is believed to clear heat, dry dampness, and reduce swelling. Edema, often interpreted as a manifestation of "dampness" in TCM theory, may be addressed using such herbs as part of complex multi-herb formulations.

However, the scientific evidence supporting the use of Phellodendron for edema is limited. Most modern research focuses on its alkaloid content (notably berberine) and its anti-inflammatory and antimicrobial effects. While there are some preclinical studies indicating anti-inflammatory properties, direct evidence of efficacy for edema—especially in rigorous clinical settings—is lacking. Traditional texts document its usage for conditions with swelling, but the evidence remains anecdotal and not validated by controlled trials.

In summary, Phellodendron (Corktree) bark's use for edema is justified by tradition rather than robust scientific data, and should be approached with caution until further clinical evidence is available.