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Getting chilled by the current after sweating is not just a grandmother's myth, but a real threat

2026-07-19 08:09:00, Shëndeti CNA

Getting chilled by the current after sweating is not just a grandmother's

Illustrative photo: A concept art generated by Artificial Intelligence (AI), depicting the dramatic microscopic battle between our immune cells and viruses.

Have you ever been curious about how our body reacts when sweat dries in cold air, and what immune army is involved in this fierce battlefield?

For a long time, the idea that "if you sit in a draft or are exposed to the cold while sweating, you will catch a cold and get sick" was considered a "grandmother's myth" by a good part of Western medicine. Their argument was simple: viruses and bacteria cause diseases, not cold.

However, recent decades and advanced studies in immunophysiology have proven that our grandmothers were absolutely right. The cold itself does not contain viruses, but it creates the perfect conditions for existing viruses to invade us.

When we sweat, our skin is covered with a layer of water. Water has an extremely high heat capacity and latent heat of vaporization.

When we are suddenly exposed to cold air or drafts, a rapid physical transition occurs, forced evaporation. The moving air increases the rate at which moisture evaporates from the skin, changing it from a liquid to a gas. But so does heat loss. Evaporation is a process that requires large amounts of energy. To accomplish this, it draws internal heat directly from our skin, causing a sharp and rapid drop in local temperature. This phenomenon is known as local thermal shock.

In response to this rapid drop in temperature, the body activates the sympathetic nervous system to conserve heat in vital organs. This induces peripheral vasoconstriction, the strong narrowing of blood vessels in the skin and in the mucous membranes of the upper respiratory tract (nose and throat).

Why does this reduced blood supply matter?

The blood is the main route through which our defense army travels, white blood cells (neutrophils, macrophages, lymphocytes) and antibodies that act as border "patrols." When blood vessels narrow and local circulation decreases, this area is temporarily left "unguarded" and immune surveillance is weakened.

A famous Yale University study, published in the Proceedings of the National Academy of Sciences (PNAS), showed exactly how low temperatures sabotage our defenses at the cellular level through two main mechanisms.

Interferon Blockade. When a cell is infected by a virus, it produces an alarm protein called Interferon, which instructs neighboring cells to block the replication of the virus. At low temperatures, the production and effectiveness of interferon drops significantly.

Ciliary Paralysis. Our airways are lined with microscopic "eyelashes" (cilia) that constantly move to push dust and viruses out of the lungs. Exposure to cold and drying of the mucous membrane temporarily paralyzes these cilia, allowing viruses to stick to the mucosa and easily penetrate inside the cells.

A virus doesn't become powerful overnight. It needs a passageway, suitable terrain, and a window of time with reduced resistance.

This temporary weakness created by thermal shock serves as an open invitation to two types of threats.

Viruses that are already dormant in our bodies, such as Herpes Simplex Virus 1 (HSV-1). It lies hidden in the facial nerve ganglia under the control of T cells. Once immune surveillance is down, the virus gets the green light, travels along the nerve to the skin of the lip and begins rapid replication.

Respiratory viruses newly acquired from the surrounding environment.

Once the immune system stabilizes and returns to its normal function, it detects this viral activity and launches a fierce counterattack. This conflict between viral replication and the immune response produces the familiar symptoms: sore throat, nasal congestion, fatigue, or the appearance of cold sores on the lips.

To prevent this dangerous window where the immune system remains unprotected, medicine recommends some simple but vital steps:

The difference between the outside and inside temperature (with air conditioning) should never be greater than 6 to 8 degrees. If you arrive sweating from the heat, stay in an intermediate area (shade or hallway) for a few minutes before entering a very cold room.

Make sure that cold air currents (from fans, air conditioners, or open car windows) do not directly hit your neck, back, and chest.

If you are soaked in sweat, immediately wipe yourself with a damp towel and change out of wet clothes into dry cotton clothes before you expose yourself to the cold. Cotton allows the skin to breathe without trapping moisture behind the body.

Avoid drinking ice water when you are very hot, as this causes local thermal shock directly to the throat (pharynx). Consume water at room temperature.

Rinse your nose with saline (salt water) to keep the mucous membranes hydrated and protected from drying out by the air conditioner. Also, taking Vitamin C and Zinc helps keep macrophages and neutrophils active at all times./ CNA