evidence: The post lists a number of onion health tips, leading with "For Coughs, Cold and Fever", stating "Onion effectively lowers high temperatures" and advising people to "slice a piece of onion and place it on the socks to lower body temperature". [...] Dr Schwarcz says placing onions in socks may have to do with reflexology, which applies pressure to the sole of the foot to treat disease. [...] The claim that placing a slice of raw onion on the soles of your feet and putting on socks will reduce a fever is false. Experts told AAP FactCheck there is no therapeutic effect from the home remedy and the claim is not supported by medical evidence.