We all know the scenario. You head out in winter without a coat or sleep in a cold room, and a few days later, you catch a cold. For many, this is clear-cut evidence that cold equals illness. However, scientists and doctors point out that this feeling of
According to research highlighted by The Conversation, colds and the flu are caused by viruses, not cold temperatures. However, winter changes the conditions that help viruses thrive. Cold and dry air allows them to survive longer and spread more easily. Tiny droplets from breath, coughs, or sneezes dry out faster and stay in the air longer.
Your body also plays a part. Cooling of the nose and airways reduces blood flow in the mucous membranes, weakening local immunity. Defense mechanisms that would typically catch and neutralize viruses work more slowly. Combined with the dry air from heating and lower vitamin D levels due to less sunlight, the immune system has a noticeably tougher job in winter.
And then there's human behavior. In the colder months, we spend more time indoors, often in crowded and poorly ventilated spaces. That's where viruses spread most easily. Epidemiologists, therefore, refer to cold as a risk enhancer, not the direct culprit.
“Getting sick from the cold” isn't an accurate description of reality. Cold doesn't cause illnesses but creates ideal biological, environmental, and social conditions for viruses to spread faster and overcome the body's defenses more easily. And that's exactly why we feel that with the first frost comes sniffle season.
