What is frostbite?
Frostbite is a freezing injury to the body's tissues caused by prolonged exposure
to cold. It can cause lifelong (permanent) damage to the body. The most common places
affected by frostbite are the fingers, toes, cheeks, chin, ears, and nose. Ice put
directly on the skin and left too long can also lead to frostbite.
What causes frostbite?
Frostbite is caused by exposure to cold temperature, often below 32°F (0°C). Intense
cold can freeze the water in the body's cells. How severe the symptoms are depends
on several things. These include air temperature, length of time in the cold, wind
chill, dampness, and type of clothing worn.
Who is at risk for frostbite?
Frostbite can happen in minutes, or it can take hours. It depends on certain conditions
and health problems you may have that put you at greater risk.
Some conditions may lead to an increased risk for frostbite, such as:
Reduced blood circulation from health conditions, such as peripheral arterial disease
(PAD), diabetes, peripheral neuropathy, or Raynaud disease
Limited blood flow to the hands or feet due to gloves, boots, socks, or other clothing
items that are too tight
Not having the correct clothing to match the weather
Windy conditions, which cause more rapid cooling of the skin and body
Certain medicines, such as beta blockers
Alcohol or drug intoxication that results in impaired sensitivity to the cold
What are the symptoms of frostbite?
The following are the most common symptoms of frostbite:
Redness or pain in a skin area
A white or grayish-yellow skin area
Skin that feels abnormally firm or waxy
Blisters (filled with clear fluid or possibly blood-filled in more severe cases)
Black, dead skin and tissues (gangrene) in severe cases
In most cases, the person is unaware of frostbite because the frozen tissues are numb.
The symptoms of frostbite may look like other health conditions or problems. Always
check with your healthcare provider for a diagnosis.
How is frostbite diagnosed?
If there are symptoms of frostbite, seek medical care right away. Frostbite and hypothermia
both occur when skin is exposed to cold and body temperature falls.
A healthcare provider will ask about your exposure to the cold, and look at symptoms,
such as the condition of your skin. The provider will ask if you have a health condition
that may put you at risk for frostbite. Tests you may have can include X-ray, bone
scan, or MRI. These tests can help figure out the tissue damage (bone or muscle) and
help guide treatment. You will also be checked for hypothermia. Hypothermia is a more
serious health condition and needs emergency medical care.
How is frostbite treated?
With frostbite, body tissues become frozen. Permanent damage may happen if the affected
area is not treated right away. If frostbite occurs, protect the person with the following
recommendations and then get medical care:
Get the person into a warm room as soon as possible. Take off any wet clothing.
Cover the person or area in warm blankets.
Don’t walk on frostbitten feet or toes to avoid more serious damage.
Immerse the areas affected by frostbite into warm (not hot) water until normal skin
color returns. Don’t soak the affected area too long (no more than 30 minutes).
Warm the affected area using body heat. For example, placing frostbitten fingers in
Don’t rub or massage the affected area as this can cause further damage. Handle the
Don’t use anything hot, such as a heating pad, stove, or furnace, to warm the affected
area. These areas are numb and may burn easily due to a lack of sensation.
Gently wash the frostbitten area, dry, wrap in sterile bandages, and keep it clean
so it doesn’t get infected.
Talk with the healthcare provider about using an oral antibiotic or topical ointment.
You can follow these same recommendations if you are the person with frostbite.
Refreezing of thawed tissue can make tissue damage worse. So it is very important
not to try thawing frostbitten tissues unless it is certain that refreezing will not
happen. Delay thawing frozen tissue until a safe and warm location can be reached.
A frostbite condition most often goes away over a period of weeks or months.
Hospital treatment for frostbite is careful rewarming. This is done using warm water.
During this process, the frostbitten part will start to throb. Pain medicine will
likely be given to help make the process less painful. In severe cases, other medicines
may be used. These include blood thinners (medicines that dissolve blood clots) and
medicines that widen blood vessels to improve blood flow to the frostbitten area.
What are possible complications of frostbite?
The affected body part may throb for a few weeks to months. Tingling or feelings of
electric shock may also be felt. There may be cold sensitivity, chronic numbness,
chronic pain, and other symptoms that can last years. Other problems that can occur
include infection and tetanus. You may need a tetanus shot.
Rewarmed tissue must be watched to see if it recovers. If tissue dies, a condition
called gangrene can happen. Surgery may be needed to remove the dead tissue. In the
most severe cases, amputation of an affected area may be needed to prevent spreading
How can frostbite be prevented?
To prevent frostbite, do the following in cold weather:
Dress for the weather. Wear enough of the appropriate clothing layers to keep you
warm and dry. Cover exposed body parts to protect them from the cold.
Eat enough food.
Don't drink alcohol and don't smoke. They make the skin more sensitive to cold.
Try not to get wet.
Carry emergency supplies when you are out in cold weather.
If you use an ice pack, only use it for up to 15 minutes every 1 to 2 hours. To make
an ice pack, put ice cubes in a plastic bag that seals at the top. Wrap the bag in
a clean, thin towel or cloth. Never put ice or an ice pack directly on the skin.
Watch for symptoms of frostbite, such as cold, prickly skin, numbness, skin color
changes, or stiffness of body tissues.
When should I call 911?
Call 911 if you have:
Body temperature below 95°F (35°C)
Skin that is cold, numb, or tingly
Skin that is blue, white, gray, or waxy
Symptoms, such as confusion, memory loss, slurred speech, or slow and uncoordinated
Chest pain or trouble breathing
Loss of consciousness
Key points about frostbite
Frostbite is when body tissues become frozen due to prolonged exposure to cold.
Symptoms include redness or pain, numbness, a white or grayish-yellow skin area, and
skin that feels abnormally firm or waxy.
The affected area should not be rubbed or massages. Don’t use anything hot, such as
a heating pad, to warm the affected area. These areas are numb and may burn easily.
Permanent damage may happen if the affected area is not treated right away.
If tissue dies, a condition called gangrene can happen. You may need surgery to remove
the dead tissue. Amputation may be needed in the most severe cases.
Tips to help you get the most from a visit to your healthcare provider:
Know the reason for your visit and what you want to happen.
Before your visit, write down questions you want answered.
Bring someone with you to help you ask questions and remember what your provider tells
At the visit, write down the name of a new diagnosis, and any new medicines, treatments,
or tests. Also write down any new directions your provider gives you.
Know why a new medicine or treatment is prescribed, and how it will help you. Also
know what the side effects are.
Ask if your condition can be treated in other ways.
Know why a test or procedure is recommended and what the results could mean.
Know what to expect if you do not take the medicine or have the test or procedure.
If you have a follow-up appointment, write down the date, time, and purpose for that
Know how you can contact your healthcare provider if you have questions.