August 17, 2026, 8:05 am | Read time: 3 minutes
The changeable weather can be quite exhausting. Just yesterday, we had tropical temperatures, sleepless nights, and constant sweating; now, in many places, it’s barely above 20 degrees: The abrupt weather change brings relief. But what actually happens in the body when temperatures drop significantly within a few days? The answer reveals just how impressive the adaptability of the human body truly is.
After days with temperatures around 37 degrees, they are now dropping by about 15 degrees in many regions. Even though it’s still T-shirt weather, the rapid change means an adjustment for the body. The human body constantly tries to maintain its core temperature of about 37 degrees. If the outside temperature changes significantly in a short time, the cardiovascular system reacts. For healthy people, there’s usually no reason to worry. The body has effective mechanisms to keep its temperature constant. When it gets cooler, it essentially switches to an energy-saving mode for heat supply.
Vessels constrict to retain heat
“This can lead to relatively quick fluctuations in our vascular system,” explains general practitioner Dr. Thomas Aßmann. “In warmth, our vessels are wide open; in cold, they constrict to prevent heat loss.” Due to the constriction of blood vessels, less warm blood reaches the outer body regions. The warmth remains more in the body’s interior. That’s why hands, feet, or even the tip of the nose often get cold faster when temperatures drop.
Some people notice such weather changes more than others. The constriction of vessels can increase blood pressure and thereby put more strain on the heart. “This can lead to circulatory problems, and headaches are often common,” says Aßmann.
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Who is particularly sensitive to cold
Nevertheless, no one should assume they’ll freeze or experience severe discomfort due to a normal temperature drop. Healthy people usually adapt to the changed conditions without issue. However, older individuals and those with cardiovascular diseases may react more sensitively. When blood vessels constrict, the heart has to work against higher resistance, which demands more from the body.
How to weather the change well
To cope well with the weather change, one should pay attention to a few simple measures. “Only sufficient exercise, a balanced diet, and especially the right clothing can help,” advises Aßmann. It’s crucial to adjust clothing to the changed temperatures, even if it still feels like midsummer after the hot days.
When temperatures suddenly drop by about 15 degrees, it doesn’t put the body on high alert. Instead, the blood vessels constrict, the circulatory system adapts, and the body works to maintain the core temperature of about 37 degrees. For most people, this process is a normal and effective adaptation mechanism.