Hypothermia: A Comprehensive Guide
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
Published on April 4th, 2026. Updated on August 28th, 2026.
Key Takeaways
Hypothermia occurs when your body temperature drops below 95°F (35°C), disrupting normal body functions
Exposure to cold air, water, or wind can cause hypothermia within minutes to hours
Early signs include shivering, confusion, and clumsiness that can progress to life-threatening complications
Gradual rewarming is the primary treatment, but severe cases require immediate medical intervention
Prevention through proper clothing, staying dry, and recognizing early warning signs can save lives
Overview
Hypothermia is a dangerous medical condition that happens when your body loses heat faster than it can produce it. This causes your core body temperature to drop below 95°F (35°C). When this occurs, your heart, nervous system, and other organs can't work properly.
Anyone can develop hypothermia, but certain groups face higher risks. Older adults, young children, and people with certain medical conditions are more vulnerable. Even healthy adults can develop hypothermia if exposed to cold conditions long enough.
Hypothermia affects thousands of people each year. Many cases happen during outdoor activities like hiking, camping, or water sports. However, it can also occur indoors if heating fails or in people who can't afford adequate heating. Understanding the signs and knowing how to respond can mean the difference between life and death.
Symptoms & Signs
Hypothermia symptoms develop gradually and can be easy to miss at first. The condition progresses through three stages, each with distinct warning signs that become more severe.
Primary Symptoms
Mild shivering that may become violent and uncontrollable as body temperature continues to drop
Confusion and difficulty thinking clearly, including poor decision-making and memory problems
Clumsiness and loss of coordination, making simple tasks like buttoning clothes difficult
Slurred speech and mumbling, which can also occur in other serious medical conditions
Drowsiness and extreme fatigue, often leading to the dangerous urge to sleep
Skin changes including pale, cold skin that may appear blue or gray, especially around lips and fingertips
Slow, shallow breathing and weak pulse as the heart struggles to maintain circulation
When to Seek Care
Contact emergency services immediately if you suspect hypothermia, especially if the person is confused, has stopped shivering despite being cold, is losing consciousness, or has very slow breathing or heart rate.
When to Seek Immediate Care
Contact emergency services if you suspect hypothermia, especially if the person is confused, has stopped shivering, or is losing consciousness. Move the person out of the cold if this can be done safely, handle them gently, and follow the emergency dispatcher's instructions. If they are unresponsive and not breathing normally, begin CPR and use an AED if available.
Causes & Risk Factors
Age
Risk Factors
People at higher risk include infants, adults over 65, people who produce less body heat or have circulation problems, people with diabetes, heart disease, or anemia, and those with increased exposure due to alcohol use, outdoor work, or homelessness.
Genetics
Some people naturally produce less body heat or have circulation problems
Lifestyle
Alcohol use, outdoor work, and homelessness increase exposure risks
Other Conditions
Diabetes, heart disease, and conditions affecting circulation like anemia
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Diagnosis
Diagnosis
Medical History & Physical Examination
Your doctor will ask about recent cold exposure, activities, and when symptoms started. They'll want to know about any medical conditions or medications that might affect your body's ability to regulate temperature. The physical exam focuses on checking your core body temperature, mental state, and signs of frostbite.
During the examination, medical professionals assess your level of consciousness and coordination. They'll check your skin color and temperature, listen to your heart and lungs, and test your reflexes. These findings help determine the severity of hypothermia.
Diagnostic Testing
Core temperature measurement using special thermometers that can read very low temperatures accurately
Blood tests to check for complications like changes in blood chemistry or signs of infection
Heart monitoring (ECG) to detect irregular heart rhythms that can occur with severe hypothermia
Blood gas analysis to check oxygen and carbon dioxide levels in severe cases
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Treatment Options
Treatment focuses on preventing further heat loss and gradually warming the body. The speed and method of rewarming depend on how severe the hypothermia is.
Conservative Treatments
Passive external rewarming involves moving to a warm environment, removing wet clothing, and covering with blankets
For mild hypothermia, warm the center of the body with safe, controlled heat sources. Avoid very hot baths and do not place heating pads directly on the skin. Moderate or severe hypothermia requires emergency medical care.
Offer a warm, nonalcoholic drink only if the person is fully alert and can swallow safely. Do not delay emergency care to provide fluids.
Gentle handling to avoid triggering dangerous heart rhythms that can occur in severe cases
Advanced Treatments
Active internal rewarming through warm intravenous fluids, heated oxygen, or body cavity irrigation for severe cases
Extracorporeal rewarming using machines to warm the blood outside the body when other methods aren't effective
Cardiac support with medications or devices if the heart stops functioning properly during treatment
Living with the Condition
Daily Management Strategies
After experiencing hypothermia, pay extra attention to staying warm in cool weather. Keep emergency supplies in your car and home, including blankets, warm clothes, and non-perishable food. Learn to recognize early warning signs in yourself and others, especially if you've had hypothermia before.
Do not rely on developing cold tolerance to prevent hypothermia. Limit exposure, check conditions, dress in dry layers, and have a plan to get warm quickly. Always dress in layers and keep extra clothing available.
Stay hydrated and eat regular meals to help your body maintain its temperature. Dehydration and low blood sugar can make you more susceptible to getting cold quickly.
Exercise & Movement
During planned cold-weather activity, gentle movement can help produce heat if you are otherwise well and remain dry. Do not use exercise to treat suspected hypothermia; stop the activity, prevent further heat loss, and seek emergency help when indicated. Activities like walking or gentle stretching can improve circulation without causing excessive sweating that leads to heat loss. Maintaining circulation is important, but avoid activity that causes excessive sweating or delays treatment for suspected hypothermia.
Avoid alcohol before or during cold weather exposure, as it can impair your judgment and body's ability to regulate temperature. If you have medical conditions or take medications that affect circulation, consult with your healthcare provider about safe cold weather activities.
Prevention
Dress in layers with moisture-wicking base layers, insulating middle layers, and waterproof outer layers
Keep dry by changing out of wet clothes immediately and avoiding cotton in cold, wet conditions
Stay hydrated and fed as your body needs fuel to generate heat and maintain proper circulation
Plan ahead by checking weather conditions, telling others your plans, and carrying emergency supplies
Know the signs of hypothermia in yourself and others, especially during outdoor activities in cold or wet conditions.
Limit time outdoors in extremely cold conditions and take frequent breaks to warm up
Maintain home heating and have backup heating sources available during power outages
Frequently Asked Questions
Hypothermia can develop within 10-15 minutes in ice-cold water or within several hours in cold air. The speed depends on temperature, wind, wetness, and your clothing. Age and health conditions also affect how quickly your body loses heat.
Yes, indoor hypothermia can occur when heating systems fail or aren't adequate. Elderly people and those with certain health conditions are particularly at risk. Even temperatures around 60-65°F can cause hypothermia in vulnerable individuals over time.
Hypothermia affects your entire body's core temperature, while frostbite damages specific body parts exposed to extreme cold. You can have both conditions at the same time, and both require immediate medical attention to prevent serious complications.
No, shivering actually stops in severe hypothermia as your body's energy reserves become depleted. When someone stops shivering despite being cold, it's often a sign that hypothermia has become life-threatening and requires immediate emergency care.
Yes, certain medications can affect your body's ability to regulate temperature or recognize cold. These include some blood pressure medications, antidepressants, and drugs that affect circulation. If you take medication that may affect temperature regulation, cold awareness, or circulation, ask your healthcare professional about appropriate precautions.
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