Synopsis

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

Onion (Allium cepa) has a long history of use in traditional and folk medicine for treating congestion and sinus issues. In many cultures, raw onions are sliced and placed near the bedside, or onion juice is inhaled, with the belief that the strong-smelling volatile compounds help clear nasal passages and ease breathing. The main traditional rationale lies in the pungent sulfur compounds (such as allicin and thiosulfinates) released when onion is cut or crushed, which may act as mild irritants, stimulating mucus flow and potentially helping to clear blocked sinuses.

Scientifically, there is limited direct evidence to support the efficacy of onion for relieving sinus congestion. Some in vitro studies suggest that onion’s sulfur-containing compounds have mild antimicrobial and anti-inflammatory properties, but clinical trials verifying its effectiveness for sinus congestion in humans are lacking. The practice persists largely due to anecdotal reports and cultural tradition, rather than robust scientific validation. Overall, while onions may provide a subjective sensation of relief due to their strong aroma and mild irritant effects, they should not be considered a primary or evidence-based treatment for sinus congestion. More research is needed to determine any therapeutic benefit beyond traditional practices.

More about onion
More about Congestion (sinus)

Other ingredients used for Congestion (sinus)

Other health conditions supported by onion

Products containing onion