“Being cold causes you to catch a cold (illness).”

The idea that chilly temperatures directly lead to sniffles and sneezes is a belief with deep historical roots. For centuries, before the advent of germ theory, illnesses were often attributed to environmental factors. Ancient medical theories, such as Hippocrates' theory of bodily humors or the miasma theory, suggested that "bad air" or specific weather conditions, like dampness and cold, could directly cause disease. The very word "influenza" even stems from an Italian term meaning "influence of the cold," reflecting a long-held association between cold weather and illness.

However, modern science has unequivocally busted this old wives' tale. The common cold is caused by viruses, primarily rhinoviruses, of which there are over 200 different types. These viruses spread through contact with an infected individual, either via airborne droplets from coughs and sneezes or by touching contaminated surfaces. While cold weather itself cannot generate a virus, it can indirectly affect our susceptibility. Research indicates that colder temperatures can temporarily suppress the immune response in the nasal passages, and dry winter air can dry out protective mucous membranes, making it easier for viruses to take hold.

People commonly believe this myth because colds do indeed become more prevalent during colder months. This observable correlation, however, is largely due to behavioral changes rather than the cold itself. When temperatures drop, people tend to spend more time indoors in closer proximity to one another, creating ideal conditions for viruses to spread from person to person. Additionally, viruses that cause colds and flu can survive and transmit more effectively in the lower temperatures and humidity often found in winter environments. So, while bundling up for warmth is always a good idea for comfort, it's the invisible viruses, not the cold air, that are the true culprits behind a cold.