“Cold weather causes colds”

It is a long-standing misconception that simply being exposed to chilly weather, or perhaps venturing outside with wet hair, will inevitably lead to catching a cold. This idea has likely been passed down through generations, rooted in observations made long before the scientific understanding of infectious agents. The very name "common cold" seems to reinforce this ingrained association, suggesting that cold temperatures are the direct cause of the sniffles and sneezes.

However, scientific evidence clearly demonstrates that cold weather itself does not cause a cold. Colds are viral infections, most frequently caused by rhinoviruses, among over 200 other types of viruses. These microscopic invaders spread from person to person primarily through respiratory droplets released when an infected individual coughs or sneezes, or by touching contaminated surfaces and then one's face. Your body temperature dropping due to environmental cold does not introduce a virus into your system.

So, why do people commonly believe this myth, and why do we experience a surge in colds during the colder months? The strong correlation between winter and increased illness often leads to a false assumption of causation. The truth lies not in the temperature outside, but largely in our behavior during winter. People tend to spend more time indoors, often in poorly ventilated spaces and in closer proximity to others, which creates an ideal environment for respiratory viruses to spread efficiently from one host to another. Additionally, some research suggests that cold and dry air can help viruses survive longer and may even slightly reduce the immune response in the nasal passages, further contributing to the increased prevalence of colds in winter.