What Should I Do If I Think I've Been Bitten By A Black Widow Spider?

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HealthlineSubscribePoisoning Due to Black Widow Spider Venom (Black Widow Spider Bites)

Medically reviewed by Daniel Murrell, M.D. — Written by Gretchen Holm — Updated on July 30, 2019

Symptoms
Causes
Treatments

If you suspect you’ve been bitten by a black widow spider, seek immediate medical attention. While these bites typically aren’t life threatening, they require quick treatment to avoid complications.

Black widow spiders are easily recognizable. They’re plump, black, and shiny, with an hourglass-shaped, red mark on their abdomens. Sometimes, this red mark may take a slightly different shape. In other cases, the spider may have red markings on its back too.

This type of spider gets its name from its historically reported mating behavior. After mating, females of some species kill and then eat their male partners, leaving them as “widows.” This behavior is dependent on several factors, including the species, the age of the female, and hunger level.

These spiders aren’t aggressive and only bite when they feel threatened. The bites usually aren’t fatal, but they can still cause some serious and uncomfortable symptoms.

If a black widow spider has bitten you, get medical treatment right away.

This spider type is found throughout the world. While they’re found all over the United States, they’re most common in the Southern and Western states.

What are the symptoms of black widow spider venom poisoning?

You’ll usually feel the sensation of a minor pinprick when a black widow spider first bites you. You might not realize that you’ve been bitten at first unless you caught the spider in the act. In some cases, the bite might be painful right away.

The area around the bite will likely redden and begin to swell.

You’ll develop more serious symptoms within a few hours of the bite. Sometimes, the more serious symptoms can develop in as little as 15 minutes after the bite occurs.

Most commonly, you’ll experience pain that’s not limited to the bite location. Your chest and abdomen, in particular, will be painful. The muscles in these areas will cramp and go rigid due to severe muscle spasms. Your back and shoulders may also hurt.

Other signs and symptoms you might experience include:

difficulty breathing, which is due to paralysis of the diaphragm
nausea
chills
a severe increase in blood pressure
a headache, which may be partially due to a change in blood pressure
sweating
weakness
a fever

In rare and extreme cases, black widow spider venom poisoning may lead to seizures and even death.

Death generally doesn’t occur in healthy adults. Young people, the elderly, and those with weakened immune systems are more susceptible to serious complications and death from a black widow spider bite.

Regardless, anyone who has been bitten, or who suspects they’ve been bitten by a black widow spider, should seek medical treatment immediately.

What causes a black widow spider to bite?

Black widow spiders are reclusive and not aggressive. They’ll never seek you out to bite you. Instead, they only bite in self-defense or when they feel threatened.

Black widow spiders live in dark, hidden spots, such as in piles of rocks, leaves, or wood. Don’t move or disturb these piles without wearing gloves, as you might accidentally touch a black widow spider and get bitten.

You should also wear gloves when you’re moving things out of dark corners in garages or basements. Black widow spiders may live in these areas.

These spiders might also hide in a variety of other dark places, such as:

inside your shoes, especially if they’re stored somewhere dark
in piles of unused blankets
in the crevices of porch furniture
between stones in a rock wall

How is black widow spider venom poisoning treated?

Treatment for a black widow bite will vary depending on your health, symptoms, and the severity of the bite.

You may be given medication to help ease your pain. You might also be given medications to help lower the high blood pressure that sometimes accompanies a black widow spider bite.

If the bite is more severe, you may need muscle relaxants or antivenom, which is an antitoxin used to treat venomous bite. In some cases, you may even need to be hospitalized.

You should go to a doctor or emergency room right away if a black widow spider has bitten you.

There are some steps you can take immediately preceding your trip to the hospital or on the way to the hospital.

Wash the bite thoroughly with soap.
Apply a wet or damp ice pack for 10 minutes at a time, with 10-minute breaks in between.
Elevate the location of the bite, if possible. For example, if you were bitten on your hand, keep your arm over your head. You should get to a hospital as soon as possible.

How we reviewed this article:

SourcesHistoryHealthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

Black widow. (n.d.).https://kids.nationalgeographic.com/animals/black-widow/
Hey! A black widow spider bit me! (n.d.).https://kidshealth.org/en/kids/black-widow.html
Mayo Clinic Staff. (2017). Spider bites.https://www.mayoclinic.org/diseases-conditions/spider-bites/symptoms-causes/syc-20352371
Mayo Clinic Staff. (2018). Spider bites: Firstaid.http://www.mayoclinic.org/first-aid/first-aid-spider-bites/basics/art-20056618
Spider bites. (n.d.).http://www.hopkinsmedicine.org/healthlibrary/conditions/adult/non-traumatic_emergencies/spider_bites_85,P00860/
Venomous spiders. (2018).http://www.cdc.gov/niosh/topics/spiders/

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Medically reviewed by Daniel Murrell, M.D. — Written by Gretchen Holm — Updated on July 30, 2019

What Should I Do If I Think I've Been Bitten By A Black Widow Spider?

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What are the symptoms of black widow spider venom poisoning?

What causes a black widow spider to bite?

How is black widow spider venom poisoning treated?

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