Hypothermia Stages: Symptoms, Definition, Death (2024)

Hypothermia (Low Body Temperature) Symptoms
- What Are Symptoms of Hypothermia?
Causes
- What Causes Hypothermia?
Diagnosis
- How Is Hypothermia Diagnosed?
Treatment
- What Is the Treatment for Hypothermia?
Complications
- What Are Complications of Hypothermia?
Prevention
- How Do You Prevent Hypothermia?
Guide

Hypothermia is a medical emergency caused by prolonged to very cold temperatures and your body temperature drops below 95°F/35°C. A person can die from hypothermia in as little as under one hour.

Hypothermia is a medical emergency caused by prolonged exposure to very cold temperatures and the body loses heat faster than it can produce it. Normal body temperature is about 98.6°F/37°C. When body temperatures drop below 95°F/35°C it is considered hypothermia.

The onset of hypothermia can occur slowly and it can affect the brain, so many people who have hypothermia are not aware of it.

How long it takes to die from hypothermia depends on several factors, including whether the cold exposure is in air or water, how cold the temperatures are, and the person’s underlying health and age. Depending on the conditions, hypothermia can occur within minutes to hours, or slowly over days to weeks.

In the air, hypothermia can develop in as little as five minutes in temperatures of minus -50°F/-45.5°C in people who are not dressed properly and have exposed skin. At -30°F/-34.4°C, hypothermia can occur in about 10 minutes. Death can occur in under an hour in extremely cold conditions.

People die of hypothermia faster in water than in air, because water has a high thermal conductivity that can cool a person at least 24-times faster than air.

A person who is immersed in near-freezing water at temperatures of 32.5°F/0.3°C will have symptoms of mild hypothermia in under 2 minutes and will be unconscious in less than 15 minutes, with an expected survival time of 15 to 45 minutes.

What Are Symptoms of Hypothermia?

Symptoms of mild hypothermia (body temperature of 90° to 95°F/32° to 35°C) include:

Shivering
Goosebumps
Bluish skin
Confusion
Trouble speaking clearly
Memory problems
Altered judgment
Breathing faster than usual (hyperventilation)
Loss of balance or coordination/clumsiness
Apathy
Fast heart rate
Urinating more than usual

Symptoms of moderate hypothermia (body temperature of 82° to 90°F/28° to 32°C) include:

Shivering stops
Feeling very tired
Seeing things that are not there (hallucinations)
Shallow breathing
Decreased reflexes
Paradoxical undressing (undressing despite the need for clothing to keep warm)
Stupor
Increased risk for abnormal heartbeats (arrhythmias)
Dilated pupils

Symptoms of severe hypothermia (body temperature less than 82°F/28°C) include:

Stiffness
Low blood pressure
Muscle rigidity
Passing out
Coma
Unresponsiveness
Breathing stops
Heart stops

Symptoms of hypothermia in babies may also include:

Bright red, cold skin
Very low energy

What Causes Hypothermia?

Hypothermia is caused by prolonged exposure to extremely cold temperatures.

Risk factors for developing hypothermia include:

How Is Hypothermia Diagnosed?

In addition to a patient history and physical examination, tests used to diagnose hypothermia include:

Arterial blood gas determination
Blood tests
- Hematocrit levels
- Electrolytes
- potassium levels
- blood glucose levels
- Coagulation tests
Imaging tests
- Chest X-ray
- Computerized tomography (CT) scan of the head for trauma
Electrocardiogram (ECG or EKG)

What Is the Treatment for Hypothermia?

Hypothermia is a medical emergency. If signs of hypothermia are present, take the person’s temperature. If it is below 95°F/35°C call 9-1-1 or get the person to a hospital’s emergency department right away.

If a person’s temperature is above 95°F/35°C or while waiting for first responders, attempt to warm the person. First aid for hypothermia includes:

Moving to a warmer place as soon as possible
Removing wet clothing
Covering the person with blankets; use an electric blanket if possible, making sure the center of the body (chest, neck, head, and groin) is covered and not wet
Provide warm beverages if the person is able to drink
- Avoid alcohol
- Do not try to give fluids to an unconscious person

If frostbite is suspected, do not massage or rub affected skin because it can cause damage.

Severe hypothermia is treated in a hospital and treatment may include:

Blankets, heating pads, warm baths, or heaters that blow warm air to help bring a person's body temperature back up
Warm fluids given intravenously (IV)
Warm oxygen to breathe, or a breathing tube if needed
Warming the inside of the body with water
Medicines to treat related issues like low blood pressure or heart problems
Blood rewarming
- A special machine draws blood out of the body, warms it up, and puts it back in

What Are Complications of Hypothermia?

Complications of hypothermia may include:

Cardiac arrhythmias at temperatures below 86-89.6°F/30-32°C
Infection
Aspiration pneumonia
Pulmonary edema
Pancreatitis
Bleeding diathesis
Bladder atony
Frostbite
Electrolyte abnormalities (high potassium, low blood sugar)
Hematocrit, coagulation study abnormalities

How Do You Prevent Hypothermia?

Hypothermia can often be prevented by:

Not staying outside in the cold for extended periods
Dressing warmly and wearing layers
Remove wet clothes as soon as possible once you get to a warm place
Make sure children are dressed warmly and don’t let them play outside in the cold for long periods
Make sure the homes of elderly people are sufficiently heated in winter
Don’t drink too much alcohol

From

Healthy Resources

Is It a Break or a Sprain?

Featured Centers

References

https://www.uptodate.com/contents/hypothermia-the-basics?search=Hypothermia&source=search_result&selectedTitle=1~150&usage_type=default&display_rank=1
https://emedicine.medscape.com/article/770542-overview
https://seagrant.umn.edu/programs/recreation-and-water-safety-program/hypothermia#graphics
https://web.archive.org/web/20081208180845/http://www.usps.org/national/ensign/uspscompass/compassarchive/compassv1n1/hypothermia.htm