Hypothermia: Causes, Symptoms, Diagnosis, Treatment & Prevention

Hypothermia is a potentially life-threatening condition that occurs when the body loses heat faster than it can produce it, causing the core body temperature to drop below 35°C (95°F). Although it is commonly associated with extremely cold climates, hypothermia can occur in moderate temperatures as well—especially when a person is exposed to wind, rain, or wet clothing.

This condition affects people of all ages, but certain groups—such as infants, older adults, outdoor workers, and those with underlying medical issues—are at a higher risk. Recognizing the early signs of hypothermia is crucial because prompt action can save a life. Untreated hypothermia can lead to respiratory failure, heart rhythm disturbances, organ shutdown, and even death.

What Is Hypothermia?

Hypothermia occurs when the body’s thermoregulatory system fails to maintain its normal temperature. Normally, the human body keeps a constant internal temperature around 37°C (98.6°F). When exposed to cold conditions for too long, the body’s heat loss surpasses heat production.

Heat is lost primarily through:

• Radiation

• Conduction

• Convection

• Evaporation

If immediate steps aren’t taken to restore warmth, vital organs—including the heart and brain—begin to malfunction.

Causes of Hypothermia

1. Prolonged Exposure to Cold Weather

Remaining outside in snow, rain, or chilly winds for extended periods.

2. Immersion in Cold Water

Water extracts heat much faster than air, leading to rapid drop in body temperature.

3. Inadequate Clothing or Shelter

Improper gear significantly increases heat loss.

4. Air Conditioning Exposure

Older adults and infants may develop hypothermia indoors.

5. Alcohol or Drug Use

These substances impair the body’s natural thermoregulation.

6. Medical Conditions

Conditions such as diabetes, hypothyroidism, stroke, and dementia increase risk.

7. Trauma or Shock

Injuries and blood loss disrupt temperature regulation.

Signs and Symptoms of Hypothermia

Early Symptoms

• Shivering

• Cold, pale skin

• Numbness in fingers and toes

• Glassy stare

• Confusion

• Slurred speech

• Poor coordination

Moderate Symptoms

• Excessive or stopping of shivering

• Increased confusion

• Slow breathing

• Low blood pressure

• Extreme fatigue

Severe Symptoms

• Weak or no pulse

• Shallow breathing

• Unconsciousness

• Dilated pupils

• Stiff muscles

Stages of Hypothermia

1. Mild Hypothermia (32–35°C)

• Shivering

• Numbness

• Rapid breathing

2. Moderate Hypothermia (28–32°C)

• Confusion

• Slurred speech

• Slow heart rate

3. Severe Hypothermia (Below 28°C)

• Unconsciousness

• Risk of cardiac arrest

Risk Factors for Hypothermia

• Infants and young children

• Elderly adults

• Outdoor workers

• Hikers, trekkers, and swimmers

• People with chronic diseases

• Individuals consuming alcohol

• Homeless persons

Diagnosis of Hypothermia

1. Physical Examination

Doctors evaluate mental status, breathing, and skin temperature.

2. Core Temperature Measurement

Rectal temperature is most accurate.

3. Blood Tests

Used to assess electrolyte imbalance and glucose levels.

4. ECG

Monitors abnormal heart rhythms associated with hypothermia.

Treatment of Hypothermia

Emergency First Aid

• Move the person to a warm environment

• Remove wet clothing

• Wrap them in blankets

• Use warm compresses on chest, neck, and groin

• Provide warm drinks (if conscious)

Medical Treatment

Passive Rewarming

Blankets and warm clothing to support natural heat generation.

Active External Rewarming

Heating blankets, radiant warmers, warm air blowers.

Active Internal Rewarming

Warm IV fluids, airway rewarming, dialysis-based warming.

Doctors must monitor the patient closely to prevent complications like arrhythmias.

Complications of Hypothermia

• Frostbite

• Heart rhythm problems

• Respiratory failure

• Kidney damage

• Memory impairment

• Muscle breakdown

• Death

Prevention of Hypothermia

1. Dress in Layers

Wear thermal innerwear, gloves, socks, and jackets.

2. Avoid Getting Wet

Stay dry and avoid sweating in cold weather.

3. Limit Exposure

Reduce time outdoors during severe cold or wind.

4. Keep Indoor Spaces Warm

Especially for infants and older adults.

5. Avoid Alcohol

Alcohol increases heat loss.

6. Eat Well

Maintain good nutrition and energy levels.

7. Prepare for Outdoor Activities

Carry emergency supplies like blankets and heat packs.

8. Monitor Vulnerable Individuals

Ensure that children and elderly adults are dressed warmly.

Hypothermia in Infants and Elderly Adults

Infants

• Cannot regulate body temperature well

• Show fewer signs like shivering

• Warning signs include low energy, bright red cold skin, weak crying

Elderly Adults

• Reduced metabolism

• May not feel cold easily

• Higher risk from inadequate heating or poor diet

When to Seek Medical Attention

Seek emergency help if someone has:

• Slowed breathing

• Sudden confusion

• Unconsciousness

• Stiff muscles

• Cold, blue skin

• Stopped shivering

Immediate attention is crucial to avoid fatal outcomes.

FAQs on Hypothermia

1. Can hypothermia happen indoors?

Yes, especially among older adults exposed to cold environments for long periods.

2. How quickly does hypothermia occur?

It can start within minutes in cold water or develop over hours in cold air.

3. Is shivering always a sign of hypothermia?

Shivering is an early indicator that the body is losing heat rapidly.

4. What should not be done in hypothermia first aid?

Avoid rubbing arms/legs, using hot water directly, or giving alcohol.

5. Can hypothermia cause long-term damage?

Severe hypothermia may lead to brain damage, heart problems, or memory loss.

6. Who is most at risk?

Infants, elderly adults, people with chronic diseases, and those using alcohol.

7. Can hypothermia occur in India?

Yes. It is common in hill stations, winter seasons, flooded areas, and poorly heated homes.

8. What differentiates frostbite from hypothermia?

Frostbite affects local tissues; hypothermia affects the entire body.

Hypothermia is a preventable yet dangerous condition. Recognising the early warning signs—such as shivering, numbness, confusion, and slowed breathing—is crucial. Quick intervention and proper rewarming methods can save lives. Staying dressed appropriately, avoiding alcohol in cold environments, and keeping vulnerable individuals safe are essential preventive steps.

Sparsh Doctor List