Can you get sick from going out with wet hair in cold weather?

Going out with wet hair in cold weather is a common belief for causing cold and flu symptoms. However, there is no scientific evidence that wet hair or exposure to cold temperatures can directly cause illness.

Cold and flu are caused by viruses that are transmitted through the air, by touching contaminated surfaces, or by coming into contact with infected people. When the body is exposed to cold temperatures, it tries to maintain its core temperature by constricting blood vessels and reducing blood flow to the extremities, including the scalp. This does not lower the body's immunity or make it more susceptible to illness.

That being said, exposure to cold temperatures can weaken the body's immune system and make it more vulnerable to infections. If you are already sick or have a weakened immune system, going out with wet hair in cold weather could make you more susceptible to catching a cold or flu. It is always a good idea to dress appropriately for the weather, including wearing a hat or scarf to cover your head and neck, and to avoid unnecessary exposure to sick people.