Also called onion in the room, onions absorb flu, onion in socks
The folk belief that a cut onion left in a room soaks up germs and sickness, best known from a story set in the 1918 flu. It is a charming kitchen custom but does not prevent or cure illness.
TraditionEuropean and American household folk remedy
RegionBritain, Europe, United States
EraPossibly pre-modern; popular story from the 20th century
Moon◐ Any moon
DayAny
ElementEarth
Difficulty●○○ Simple
Time5 minutes
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The working
Treat this as a comfort ritual alongside real care. If you or someone at home is ill, rest, drink fluids and call a doctor when needed.
Peel the onion and cut it in half while saying what you want cleared from the house, such as 'tiredness and sickness, out'.
Set each half cut side up on a saucer, one in the sickroom and one in the kitchen.
Open the window for a few minutes each day to let fresh air through, which genuinely helps a stuffy room.
After one day, throw the onion halves away outside or in the compost. Do not cook with an onion that has been sitting out.
If you want an edible version, slice a fresh onion into a jar, cover with honey and use a spoonful of the syrup in warm water, as many grandmothers did.
Take care: A cut onion does not prevent or treat flu, COVID or any infection; see a doctor for illness. Onions are toxic to dogs and cats, so keep saucers out of their reach, and do not eat onion that has sat out cut. Never give honey to a child under one year old.
Versions across time and place
i
The 1918 flu tale
American internet folklore · Story set in 1918, circulated widely from the 2000s
A widely forwarded story claims a doctor in 1918 found one healthy farm family who kept cut onions in every room, and that the onions held the flu virus under a microscope. No record of the doctor exists, and viruses could not be seen with microscopes of that time.
Uses: cut onions
Recorded in: Lead Stories fact check (2020); National Onion Association statement
ii
Onions in socks
Modern viral remedy · 2010s
Sliced onion placed in socks overnight is said to draw out toxins or fever through the feet. There is no evidence for it, though it is harmless for most people apart from the smell.
Uses: onion slices, socks
Recorded in: Fact checks of viral onion remedies, including Lead Stories (2020)
iii
Onion and honey syrup
European household remedy · Traditional
Instead of setting the onion out, cooks layered sliced onion with honey or sugar and spooned the syrup for coughs. It is a soothing kitchen remedy and not a substitute for medical care. Do not give honey to babies under one year old.
Uses: onion, honey
Recorded in: Common household practice in Britain, Germany and Eastern Europe
History
Belief in the cut onion grew out of miasma theory, the long-held idea that disease spread through bad air. If sickness floated in the air, a strong-smelling bulb might draw it in. The National Onion Association, which has every reason to praise onions, says there is no evidence that a cut onion absorbs germs, and that cold and flu viruses spread mainly through people, not by drifting into vegetables.
The best-known version is a story said to come from the 1918 influenza pandemic, which killed tens of millions worldwide. It describes a doctor who finds a family in good health with onions in every room. Fact checkers, including Lead Stories in 2020, found no source for it and noted that the influenza virus was not even isolated until 1933. The custom survives as gentle kitchen folklore.