Heatwave Intensifies Sensitivity to Fragrances, Causing Physical Distress

The current heatwave has intensified a little-known condition called hyperosmia, which causes an extreme sensitivity to certain smells, particularly strong fragrances. This condition can lead to gagging and migraines, transforming everyday scents into a source of physical distress for sufferers.

The escalating temperatures mean that fragrance molecules transition from liquid to gas much faster on hot, moist skin. This effect can turn a person wearing perfume into a "walking, 6ft-tall plug-in air freshener," as described by one individual experiencing hyperosmia. The problem is compounded by the increasing popularity of layering scents and building "fragrance wardrobes," contributing to a boom in the fragrance market, which grew by 8 percent to £3.3 billion in the UK last year, making it the largest market in Europe.

For individuals with hyperosmia, strong fragrances are not merely a matter of dislike but can trigger nausea, headaches, and migraines. The chemicals in perfumes are thought to irritate the trigeminal nerve, a cranial nerve responsible for sensory and motor functions in the face, causing blood vessels in the head to widen and sinuses to become inflamed. Toxicologists note that while people question the safety of food, water, and cookware, fragrances often receive a "free pass."

This secrecy is partly due to trade secret legislation, which allows companies to mask hundreds of chemicals behind the single word "fragrance" or "parfum" on ingredient lists. These fragrances are not exclusive to perfumes but are also found in a wide array of common products, including candles, detergents, cleaning supplies, shower gels, and air fresheners.

Some countries, like Canada, have implemented fragrance bans in public spaces such as government buildings, schools, and hospitals. The plea from those with hyperosmia is for individuals to be more mindful of their scent usage, especially during periods of high temperatures, and to consider toning down their fragrance use in shared public spaces like transport networks and some workplaces.