Snake and Lizard Bites
Snake and Lizard BitesSkip to the navigationTopic OverviewPoisonous snake or lizard bite A bite from a
poisonous (venomous) snake or lizard requires emergency care. If you have been
bitten by a snake or lizard that you know or think might be poisonous,
call 911 or other emergency services immediately. Do not wait for symptoms to
develop. If you are not sure what type of snake or lizard bit you,
call the Poison Control Center immediately to help
identify the snake or lizard and find out what to do next. Medicine to
counteract the effects of the poison (antivenom) can save a limb or your
life. It is important to stay calm.
Poisonous snakes or lizards found in North America include: Maine, Alaska, and Hawaii are the only states that don't
have at least one poisonous snake species in the wild. Poisonous snakebiteSymptoms of a pit viper snakebite often appear from minutes to hours after a bite. Severe
burning pain at the site usually begins within minutes, and then swelling
starts spreading out from the bite. Things that affect the
severity of a poisonous snake or lizard bite include the: - Type and size of the snake or
lizard.
- Amount of venom injected (if any).
- Potency of
the venom injected.
- Location and depth of the
bite.
- Number of bites and where they occurred on the
body.
- Age, size, and
health of the person who was bitten.
If you do not develop symptoms within 8 to 12 hours, it
is possible that no venom was injected; this is called a dry bite. At least
25%, and perhaps up to 50%, of bites are dry. If poison is released in the bite,
about 35% of the bites have mild injections of poison (envenomations), 25% are
moderate, and 10% to 15% are severe. It is important to remember
that a snake only injects part of its venom with each bite, so it is still
dangerous after the first strike. A bite from a young snake can be serious. And
a dead snake, even one with a severed head, can still bite and release venom by
reflex action for up to 90 minutes after it dies. Even if you do not develop
symptoms within 8 hours, continue to watch for symptoms for 2 weeks or more. Nonpoisonous snake or lizard biteMost snakes and
lizards in North America are not poisonous. Bites may be frightening, but most
do not cause serious health problems. A bite from a small nonpoisonous snake
might leave teeth marks, a minor scrape, or a puncture wound without other
symptoms. Home treatment often relieves symptoms and helps prevent
infection. Although most nonpoisonous snakebites can be treated at
home, a bite from a large nonpoisonous snake (such as a boa constrictor,
python, or anaconda) can be more serious. In North America, these snakes are
found in the Florida Everglades and zoos, but they may also be kept as exotic pets. The force of the
bite can injure the skin, muscles, joints, or bones. Other problems can occur
with a nonpoisonous snake or lizard bite even if the reptile is small. A snake
or lizard's tooth may break off in a wound or a
skin infection may develop at the site of the
bite. Check your symptoms to decide if and when
you should see a doctor. Check Your SymptomsDo you have a snake or lizard bite? How old are you? Less than 12 years Less than 12 years 12 years or older 12 years or older This is more likely if you have had a bad reaction to something in the past. Yes Possible severe allergic reaction (anaphylaxis) No Possible severe allergic reaction (anaphylaxis) Do you have symptoms of shock? Are you having trouble breathing (more than a stuffy nose)? Yes Difficulty breathing more than a stuffy nose No Difficulty breathing more than a stuffy nose Are you having a severe reaction to the bite? In a severe reaction, you may have sudden, severe swelling and sudden numbness and tingling. Yes Severe reaction to bite No Severe reaction to bite Has there been a decrease in how alert or aware you are or how well you can think and respond? Yes Decreased level of consciousness No Decreased level of consciousness Is the bite from a snake or lizard that you know is poisonous or think may be poisonous? Yes Bite from known or suspected poisonous snake or lizard No Bite from known or suspected poisonous snake or lizard Is there any numbness or tingling? Is the numbness or tingling near the bite or in the mouth, tongue, scalp, or feet? Yes Numbness or tingling near bite or in mouth, tongue, scalp, or feet No Numbness or tingling near bite or in mouth, tongue, scalp, or feet Do you have numbness or tingling below the bite? Yes Numbness or tingling below bite No Numbness or tingling below bite Are there any hives? Hives are raised, red, itchy patches of skin. They usually have red borders and pale centers. They may seem to move from place to place on the skin. Did the hives appear within the past 3 hours? Yes Hives appeared within past 3 hours No Hives appeared within past 3 hours How bad is the pain on a scale of 0 to 10, if 0 is no pain and 10 is the worst pain you can imagine? 8 to 10: Severe pain Severe pain 5 to 7: Moderate pain Moderate pain 1 to 4: Mild pain Mild pain Has the pain lasted for more than 8 hours? Yes Pain for more than 8 hours No Pain for more than 8 hours Is the pain getting worse? For an arm or leg wound, is the skin below the wound (farther down the limb) blue, pale, or cold to the touch and different from the other arm or leg? This may mean that a major blood vessel was damaged and that blood is not reaching the rest of the arm or leg. Yes Skin is blue, pale, or cold below an arm or leg injury No Skin is blue, pale, or cold below an arm or leg injury Can you move the area below the injury normally, even though it may hurt? Yes Able to move limb normally below injury No Unable to move limb normally below injury Are you nauseated or vomiting? Nauseated means you feel sick to your stomach, like you are going to vomit. Are there red streaks leading away from the area or pus draining from it? Do you think you may have a fever? Do you have diabetes, a weakened immune system, peripheral arterial disease, or any surgical hardware in the area? "Hardware" includes things like artificial joints, plates or screws, catheters, and medicine pumps. Yes Diabetes, immune problems, peripheral arterial disease, or surgical hardware in affected area No Diabetes, immune problems, peripheral arterial disease, or surgical hardware in affected area Do you think that a tooth from the snake or lizard may still be in the wound? Yes Snake or lizard tooth may still be in wound No Snake or lizard tooth may still be in wound Do you still have symptoms more than 24 hours after the bite? Yes Symptoms more than 24 hours after bite No Symptoms more than 24 hours after bite Many things can affect how your body responds to a symptom and what kind
of care you may need. These include: - Your age. Babies and older
adults tend to get sicker quicker.
- Your overall health. If you have a condition such as diabetes, HIV, cancer, or heart
disease, you may need to pay closer attention to certain symptoms and seek care
sooner.
- Medicines you take. Certain
medicines, herbal remedies, and supplements can cause symptoms or make them
worse.
- Recent health events, such as surgery
or injury. These kinds of events can cause symptoms afterwards or make them
more serious.
- Your health habits and lifestyle, such as eating and exercise habits, smoking, alcohol or drug
use, sexual history, and travel.
Try Home TreatmentYou have answered all the questions. Based on your answers, you may be
able to take care of this problem at home. - Try home treatment to relieve the
symptoms.
- Call your doctor if symptoms get worse or you have any
concerns (for example, if symptoms are not getting better as you would expect).
You may need care sooner.
Pain in adults and older children - Severe pain (8 to 10): The pain
is so bad that you can't stand it for more than a few hours, can't sleep, and
can't do anything else except focus on the pain.
- Moderate pain (5 to 7): The pain is bad enough to disrupt your
normal activities and your sleep, but you can tolerate it for hours or days.
Moderate can also mean pain that comes and goes even if it's severe when it's
there.
- Mild pain (1 to 4): You notice the pain,
but it is not bad enough to disrupt your sleep or activities.
Pain in children under 3 years It can be hard to tell how much pain a baby or toddler is in. - Severe pain (8 to 10): The
pain is so bad that the baby cannot sleep, cannot get comfortable, and cries
constantly no matter what you do. The baby may kick, make fists, or
grimace.
- Moderate pain (5 to 7): The baby is
very fussy, clings to you a lot, and may have trouble sleeping but responds
when you try to comfort him or her.
- Mild pain (1 to 4): The baby is a little fussy and clings to you a little but responds
when you try to comfort him or her.
Symptoms of infection may
include: - Increased pain, swelling, warmth, or redness in or
around the area.
- Red streaks leading from the area.
- Pus draining from the area.
- A fever.
Certain health conditions and medicines weaken the immune system's ability to fight off infection and
illness. Some examples in adults are: - Diseases such as diabetes, cancer, heart disease,
and HIV/AIDS.
- Long-term alcohol and drug
problems.
- Steroid medicines, which may be used to treat a variety
of conditions.
- Chemotherapy and radiation therapy for
cancer.
- Other medicines used to treat autoimmune
disease.
- Medicines taken after organ transplant.
- Not
having a spleen.
Symptoms of a severe allergic reaction
(anaphylaxis) may include: - The sudden appearance of raised, red areas (hives)
all over the body.
- Rapid swelling of the throat, mouth, or tongue.
- Trouble
breathing.
- Passing out (losing consciousness). Or you may feel very lightheaded or suddenly feel weak, confused,
or restless.
A severe reaction can be life-threatening. If you have had a
bad allergic reaction to a substance before and are exposed to it again, treat
any symptoms as an emergency. Even if the symptoms are mild at first, they may
quickly become very severe. You may need a tetanus shot depending
on how dirty the wound is and how long it has been since your last shot. - For a dirty wound that has
things like dirt, saliva, or feces in it, you may need a shot if:
- You haven't had a tetanus shot in the past 5
years.
- You don't know when your last shot was.
- For a clean wound, you may
need a shot if:
- You have not had a tetanus shot in the past 10
years.
- You don't know when your last shot was.
Shock is a life-threatening condition that may quickly occur
after a sudden illness or injury. Symptoms of shock (most of which will be present) include: - Passing out (losing consciousness).
- Feeling very dizzy or
lightheaded, like you may pass out.
- Feeling very weak or having
trouble standing.
- Not feeling alert or able to think clearly. You
may be confused, restless, fearful, or unable to respond to questions.
Shock is a life-threatening condition that may occur quickly
after a sudden illness or injury. Symptoms of shock in a child may include: - Passing out (losing consciousness).
- Being very sleepy or hard
to wake up.
- Not responding when being touched or talked to.
- Breathing much faster than usual.
- Acting confused.
The child may not know where he or she is.
Symptoms of difficulty breathing can range from mild to severe. For example: - You may feel a little out of breath but still be able to talk (mild difficulty breathing), or you may be so out of breath that you cannot talk at all (severe difficulty breathing).
- It may be getting hard to breathe with activity (mild difficulty breathing), or you may have to work very hard to breathe even when you’re at rest (severe difficulty breathing).
Seek Care TodayBased on your answers, you may need care soon. The
problem probably will not get better without medical care. - Call your doctor today to discuss the symptoms
and arrange for care.
- If you cannot reach your doctor or you don't
have one, seek care today.
- If it is evening, watch the symptoms and
seek care in the morning.
- If the symptoms get worse, seek care
sooner.
Seek Care NowBased on your answers, you may need care right away. The problem is likely to get worse without medical care. - Call your doctor now to discuss the symptoms and
arrange for care.
- If you cannot reach your doctor or you don't have
one, seek care in the next hour.
- You do not need to call an
ambulance unless:
- You cannot travel safely either by driving
yourself or by having someone else drive you.
- You are in an area
where heavy traffic or other problems may slow you down.
Call 911 NowBased on your answers, you need
emergency care. Call911or other emergency services now. Home TreatmentPoisonous snake or lizard biteIf you were bitten by
a snake or lizard that you know or think is poisonous, call 911 or other emergency services immediately. Do not wait for symptoms to develop.
Symptoms may progress from mild to severe rapidly. If you are not
sure what type of snake or lizard bit you, take a picture of it. But do not do
this if it will delay treatment or put someone at risk for more bites. Do
not waste time or take any risks trying to kill or bring in the snake. Only
trap a poisonous snake if the chances are good that it will bite more people if
you let it go. It is important to remember that a snake only injects part of
its venom with each bite, so it can still hurt you after the first strike. And
a dead snake, even one with a severed head, can bite and release venom by
reflex action for up to 90 minutes after it dies.
Medicine (antivenom) to counteract the effects of the poison can
save a limb or your life. Antivenom is given as soon as a doctor determines it
is needed, usually within the first 4 hours after the snakebite. Antivenom may
be effective up to 2 weeks or more after a snakebite. Immediate home treatmentImmediate home treatment
should not delay transport for emergency evaluation. - If you think the snake bite is an emergency, call 911.
- Remain calm and try to rest
quietly.
- If you are not sure what type of snake or lizard bit you,
call a Poison Control Center immediately to help
identify the snake or lizard and find out what to do next.
- Remove any
jewelry. The limbs might swell, making it harder to remove the jewelry
after swelling begins.
- Use a pen to mark the edge of the swelling
around the bite every 15 minutes. This will help your doctor estimate how the
venom is moving in your body.
Avoid these treatment measuresAvoid doing anything
that might cause more problems with the snake or lizard bite. - Do not cut the bite
open.
- Do not suck on the bite wound or use
any kind of extraction device.
- Do not use a
constriction band, such as a tourniquet or bandage, on a
bite.
- Do not soak your hand or foot in ice
water or pack your arm or leg in ice. This can increase damage to the skin and
cause a cold-induced injury, such as frostbite.
- Do not raise the bitten arm or leg above your head. This may increase the
flow of venom into the bloodstream.
- Do not drink alcohol.
- Do not give any
prescription or nonprescription medicines after a poisonous snake or lizard
bite unless your doctor tells you to. Some medicines, such as aspirin,
ibuprofen, or naproxen, may cause increased bleeding.
Nonpoisonous snake or lizard biteIf you are certain
the snake or lizard was not poisonous, use home treatment measures to reduce
symptoms and prevent infection. - Use direct pressure to stop any bleeding.
- Look at the wound to make sure a snake or
lizard tooth is not in the wound. If you can see a tooth, remove it with
tweezers, taking care to not push it farther into the wound.
- Clean
the bite as soon as possible to reduce the chance of infection, scarring, and
tattooing of the skin from dirt left in the wound. Wash the wound for 5 minutes
with large amounts of clean warm water.
- Do not use rubbing alcohol, hydrogen
peroxide, iodine, or Mercurochrome, which can harm the tissue and slow wound
healing.
- Soak the wound in warm water for 20 minutes, 2 to 4 times
a day, for the next 4 to 5 days. The warmth from the water will increase the
blood flow to the area, which helps reduce the chance of
infection.
- Puncture wounds usually heal well and may not need a
bandage. You may want to use a bandage if you think the bite will get dirty or
irritated.
- Clean the wound thoroughly and cover it with a thin layer of petroleum jelly, such as Vaseline, and a nonstick bandage.
- Apply a clean bandage when it gets wet or
soiled.
- Determine whether you need a
tetanus shot.
- An
ice or cold pack may help reduce swelling and bruising. Never apply ice
directly to a wound or the skin. This could cause tissue damage.
Medicine you can buy without a prescription Try a nonprescription
medicine to help treat your fever or pain: |
---|
- Acetaminophen, such
as Tylenol
- Do not use a nonsteroidal
anti-inflammatory drug, such as Advil, Motrin, Aleve, or aspirin.
| Safety tips Be sure to follow
these safety tips when you use a nonprescription medicine: |
---|
- Carefully read and follow all
directions on the medicine bottle and box.
- Do not take more than
the recommended dose.
- Do not take a medicine if you have had an
allergic reaction to it in the past.
- If
you have been told to avoid a medicine, call your doctor before you take
it.
- If you are or could be pregnant, do not take any medicine other
than acetaminophen unless your doctor has told you to.
| Symptoms to watch for during home treatmentCall your doctor if any of the following occur during home
treatment: PreventionSnakebites are more likely to occur in
warm-weather months when both snakes and people are more active outdoors. Most
snakebites occur on the fingers, hands, and arms when someone is working with
or trying to catch a snake. The legs and feet are also common bite sites; these
bites usually occur when a person (especially a child or a hiker) accidentally
disturbs a snake. Snakes and lizards are popular exotic pets, so
the risk for being bitten has increased. Many snake and lizard
bites can be prevented. - Find out what local snakes and lizards are found
in your area. Learn what they look like, whether they are poisonous, and where
you are most likely to see them.
- If you see a snake or lizard, do
not bother it. Keep in mind that the striking range of a snake is about
two-thirds of its length.
- Do not pick up or handle snakes. Even a
dead snake can bite and release venom through reflexes for 90 minutes or more
after it dies.
- Watch for snakes around wood or rock piles or caves.
Wear protective shoes, boots, and clothing when you are hiking, camping,
fishing, and hunting.
- Do not drink alcohol or use illegal drugs
while doing outdoor activities where you might encounter a snake. The effects
of the alcohol and drugs may slow your judgment and reflexes.
- If
you have a pet snake or lizard or are thinking about getting one, learn how to
handle it safely to avoid being bitten. Find out what first aid supplies you
will need if you are bitten, and have them handy.
If you are often in an area where there are poisonous snakes,
consider carrying a first aid kit. Carry a cellular phone, if you have one, to
call for help if you are bitten. Preparing For Your AppointmentTo prepare for your appointment, see the topic Making the Most of Your Appointment. Questions to prepare for your appointmentYou can help your
doctor diagnose and treat your condition by being prepared to answer the
following questions: - Do you know what type of snake or lizard bit you?
What did the snake or lizard look like? How big was the snake or lizard? Did it
rattle?
- When did the bite occur?
- Where were you
bitten?
- How many times were you bitten?
- What are your
main symptoms? How long have you had your symptoms?
- What home
treatment measures have you tried? Did they help?
- What
nonprescription medicines have you tried? Did they help?
- Have you
been treated for a snakebite in the past? If yes, what type of treatment did
you receive?
- What prescription and nonprescription medicine do you
take?
- How long ago was your last
tetanus shot?
- Do you have any
health risks?
CreditsByHealthwise Staff Primary Medical ReviewerWilliam H. Blahd, Jr., MD, FACEP - Emergency Medicine Adam Husney, MD - Family Medicine Specialist Medical ReviewerSean P. Bush, MD, FACEP - Emergency Medicine, Envenomation Specialist Current as ofMarch 20, 2017 Current as of:
March 20, 2017 Last modified on: 8 September 2017
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