Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Scallion (Allium fistulosum), also known as green onion or spring onion, has a history of use in traditional Chinese medicine (TCM) for treating respiratory conditions, including dry coughs. In TCM, scallions are believed to promote sweating, release the exterior (expel pathogens), and resolve phlegm, making them a common ingredient in herbal remedies for early-stage colds, coughs, and flu-like symptoms. Historical texts such as the "Compendium of Materia Medica" mention scallion as a remedy for coughs, particularly those associated with cold or wind-cold invasion, rather than dry coughs caused by heat or dryness. The typical preparation involves decocting scallion with other ingredients, such as ginger, to make teas or broths. However, there is limited to no modern scientific evidence directly supporting the efficacy of scallion for treating dry cough specifically. Most available research focuses on its antimicrobial and mild anti-inflammatory properties, which may have some indirect relevance to respiratory health, but not specifically to dry cough. Thus, the use of scallion for dry cough is mainly justified by traditional practice rather than scientific validation, and the overall quality of evidence remains low.

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