When the temperature drops, the body reacts immediately. You may start to shiver, your skin feels cold, and your fingers and toes become stiff. But what exactly happens inside the body when it is exposed to cold – and when does it become dangerous? Here’s an overview of how low temperature affects the body and how you can protect yourself, especially in the cooler regions of India or during winter months in the north.

The Body’s Natural Response to Cold

The human body works constantly to maintain an internal temperature of around 37°C. When the surroundings become cold, the body tries to preserve heat by narrowing blood vessels in the skin and extremities. This is why hands, feet, nose, and ears get cold first – the body is prioritizing warmth for vital organs like the heart and brain.

At the same time, muscles begin to shiver. These small, rapid contractions generate heat and help raise body temperature. Shivering is the body’s first defense against cold, but it consumes energy and cannot continue indefinitely.

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When the Body Becomes Too Cold

If the body is exposed to cold for too long and loses more heat than it produces, the core temperature begins to fall. When it drops below 35°C, it is called mild hypothermia. Common symptoms include:

• Shivering and chills
• Numbness in fingers and toes
• Fatigue and reduced concentration
• Slower movements and speech

With moderate hypothermia (32–35°C), shivering may stop because the muscles can no longer respond. The person may appear confused, sleepy, and uncoordinated. If the temperature continues to fall, it can become life-threatening as the heart and brain start to malfunction.

Cold and the Circulatory System

When blood vessels constrict, blood pressure temporarily rises. For people with heart conditions, this can increase the risk of heart attack or stroke. The heart also has to work harder to circulate blood, which can be a strain, especially for older adults or those with cardiovascular disease.

Cold temperatures can also reduce the blood’s ability to carry oxygen efficiently, leading to tiredness and lower physical performance, even with mild cooling.

Frostbite – When Tissue Freezes

At very low temperatures, the skin and underlying tissue can freeze. This usually happens on exposed areas such as fingers, toes, nose, and cheeks. Frostbite often begins with a tingling or burning sensation, followed by numbness. The skin may turn pale or whitish, and in severe cases, blisters or tissue damage can occur.

If frostbite is suspected, the affected area should be warmed gradually – ideally with body heat, not direct heat like hot water or a heater, as that can worsen the injury.

Cold Indoors – A Hidden Risk

Even indoors, low temperature can affect the body. In some parts of India, especially in the north and in hill regions, winter nights can be surprisingly cold, and many homes are not well insulated. If indoor temperatures fall below 18°C, it can cause muscle stiffness, discomfort, and even increase the risk of respiratory infections. Elderly people and young children are particularly sensitive because their bodies have more difficulty regulating temperature.

Maintaining a comfortable indoor temperature is therefore important – not just for comfort, but also for health. Simple measures like using warm bedding, closing gaps around windows, and wearing layered clothing indoors can make a big difference.

How to Protect Yourself from the Cold

There are several simple ways to help your body stay warm:

• Dress in layers – several thin layers insulate better than one thick one.
• Keep head, hands, and feet warm – these areas lose heat quickly.
• Eat and drink regularly – your body needs energy to produce heat.
• Move around – physical activity boosts circulation and warmth.
• Avoid dampness – wet clothes or sweat can quickly lead to cooling.

At home, ensure good insulation, use blankets, and distribute warmth evenly in rooms. In areas where heating is limited, using hot water bottles or warm drinks can help maintain comfort.

When Cold Becomes Dangerous

Most people can tolerate short periods of cold without problems, but prolonged exposure can be serious. If you or someone else shows signs of confusion, drowsiness, or stops shivering, seek medical help immediately. Hypothermia develops gradually but can have severe consequences if untreated.

Cold weather is part of life in many parts of India, especially in the northern states and hill regions. With the right knowledge and preparation, you can protect your body and stay healthy – even when the temperature drops.