“Being cold makes you catch a cold.”

The idea that being cold makes you catch a cold is a belief as old as winter itself, with roots stretching back centuries to times before the scientific understanding of disease. Historically, people observed that illnesses with runny noses and coughs were more common during colder months, leading to the logical, though incorrect, conclusion that the chill itself was the cause. This misconception was ingrained in language and culture, even before germ theory emerged in the 1950s to provide a scientific explanation for the common cold.

However, modern science has definitively busted this myth: the common cold is caused by viruses, not by exposure to cold temperatures. The most frequent culprits are rhinoviruses, a family of viruses that infect the upper respiratory tract. While cold weather does not directly cause an infection, it can create conditions that make it easier for these viruses to spread and for people to become infected. For instance, cold temperatures often drive people indoors, leading to more crowded spaces and closer contact, which facilitates the transmission of airborne viral droplets. Additionally, the dry air prevalent in colder environments can allow viral particles to remain suspended for longer and can also dry out the protective mucous membranes in our noses and throats, making them more vulnerable to viral invasion. Some research also suggests that certain cold viruses, like rhinovirus, may replicate more efficiently in the cooler temperatures found in the nasal passages.

People continue to believe this myth largely due to the strong correlation between cold weather and the increased incidence of colds. It's easy to associate shivering with sniffles when both occur during the same season. While being cold can put a slight strain on the body as it works to maintain core temperature, and some aspects of cold exposure might slightly reduce the immune system's initial response in the nasal cavity, it is not the cold itself that makes you sick. Ultimately, catching a cold requires exposure to a virus, and the best defenses remain frequent handwashing and avoiding close contact with infected individuals, rather than simply bundling up.