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Spider bite identification and symptoms

 

Whether or not a spider bite is dangerous depends on a few things. While most spider bites might not pose a risk to life, several factors can make a difference. This includes allergies to venom, the number of times you’re bitten, any existing medical conditions or vulnerabilities, and the type of spider.

For those living in the western half of the United States, such as California, Arizona, and Nevada, there is a slightly higher chance of running into arachnids that can produce a bite that might pose a health risk. The warmer, drier weather is key to these spiders surviving, and Western Exterminator spider experts can help you deal with these spiders around your property. Contact a Western Exterminator spider control technician to avoid bites and spider problems.

What do spider bites look like?

What does a spider bite look like? The only way to positively say you have a spider bite is if you watch the spider bite you and then have the spider identified. A true spider bite might look similar to other insect bites, like bee stings or mosquito bites. This makes identifying a spider bite all the more difficult. 

Most spider bites might not show up much at all. They are very rarely painful or felt at the time of the bite since the majority of species of spiders in the U.S. have fangs that are too small to be felt.

Symptoms of spider bites

Most spider bites will have little effect on people, but some species can cause a reaction due to the venom injected. Spiders do not seek humans to bite because they prefer to save their bites and venom to capture and incapacitate food. Humans are not on any spider's menu, so sometimes spiders will even provide "dry" bites that will be painful to deter further involvement, but not inject venom, leading to non-poisonous spider bites.

There is no definitive list of spider bite symptoms, and they can vary from spider to spider and from the tolerance level of the person bitten. Most spider bites go unnoticed and cause no more than a mild reaction in people, like inflammation of the skin, minor swelling, and itching. Some spider bites, however, can be difficult to heal.

When to worry about a spider bite

Knowing when to worry about a spider bite can be difficult, as spider bite symptoms vary. If you witness a spider bite and that leads to severe pain, increasing redness, swelling, or the development of an open sore, it could be a sign of a more serious reaction. Symptoms such as fever, chills, muscle cramps, difficulty breathing, or nausea may indicate an allergic response or infection.

If the person bitten experiences these symptoms or any others, medical care should be sought immediately. Even if you’re unsure, you should consult your healthcare provider.

Treatment for spider bites

While in the majority of cases, there is no need for treatment, you should seek advice from a medical professional if you are concerned. They know your medical history, which medicines are most suitable, and what is the best course of action for you. They might recommend simply taking an antihistamine or decide if other treatments like antivenom (also known as antivenin) are necessary.

Are spider bites venomous?

The majority of spider bites in the U.S. aren’t venomous or don’t contain enough venom to cause much concern. However, certain species, such as the black widow and brown recluse, possess venom that can cause significant spider bite symptoms, including pain, swelling, and in some cases, more severe reactions.

Read more facts about the bites of the black widow, brown recluse spider, and more:

A close-up of a black widow on a web

Black widow spider bites

Adult black widow spiders - Latrodectus mactans - are not naturally aggressive towards people. They are identifiable by the red, hourglass-shaped markings on their backs.

  • They only bite as a defensive measure if they feel threatened.

  • Most defensive bites to people occur when the spider is unintentionally squeezed or pinched.
  • Bites may result in localized pain, tingling, and small swelling around the bite.
  • Occasionally, more serious symptoms can occur, but they are usually an exceptional reaction of the individual to the spider’s venom. You should always consult your medical provider.
A close-up of a brown recluse spider

Brown recluse spider bites

The recluse spider - Loxosceles reclusa - usually only bites when crushed, handled, or disturbed. Both sexes are venomous. They are not found native West of the Mississippi.

  • Reactions to bites will vary - some people are unaffected, others may feel a pinprick, others a stinging sensation followed by intense pain.
  • Bites may appear depressed or crater-like over the course of a few days.
  • Some people may not be aware of the bite for two to eight hours. You should always consult your medical provider.
Hobo spider

Hobo spider bites

Hobo spiders were once believed to be a spider of medical importance. That was a myth, and the hobo spider does not pose a risk to people and pets.

  • Hobo spiders can be found in places that have cracks and crevices where they can hide. 
  • Hobo spiders are poor climbers and are most commonly found in basements and cellars. 
  • Male hobo spiders wander into buildings during their early autumn mating season. 
  • Hobo spiders are most commonly encountered in Northwestern states in the U.S. but are rapidly expanding their range in recent years.
Wolf spider

Wolf spider bites

Like many other spiders, wolf spiders are not naturally aggressive toward humans. They will bite when they feel threatened or are trapped near the skin. 

  • Wolf spiders have fang-like mouthparts that they use to capture prey. 
  • Wolf spider venom is usually not harmful to humans.
  • Wolf spider bites may result in some minor pain and redness initially but will subside over time.
  • These spiders are often confused with brown recluse spiders, but are less dangerous.
A grass spider sits on its web

Grass spider bites

Grass spiders are known for their fast movements and funnel webs, but their bites are not considered dangerous to humans. A grass spider bite on a human is rare since these spiders prefer to escape rather than bite when threatened.

  • If a grass spider bite does occur, it may resemble a mild insect bite, causing slight redness, itching, or swelling.
  • As with any spider bite, it is important to monitor for signs of infection or an unusual reaction. If symptoms persist or worsen, or you are unsure, seek medical advice.

Help prevent spider bites with our spider control services

Generally speaking, the best way to avoid spider bites is to remove them from your home or business. Western Exterminator spider control and prevention experts can provide reliable, local spider control services to get rid of spiders in the home and prevent them from returning.

If you have spotted signs of a spider infestation in your home or business and want to avoid being bitten, we can offer professional treatments. for complete removal of your problem.

Call Western Exterminator today at 800-937-8398 to discuss our spider control treatments. You can also use our online contact form to set up an appointment with one of our spider control experts.

Frequently asked questions

If you saw a spider bite you and were able to capture it for ID.  You should always consult with your medical provider if you are unsure.

Depending on the species, spider bite symptoms can appear immediately or take several hours. Some bites cause mild irritation, while others may lead to swelling, pain, or more serious reactions. You should always consult your medical provider.

Skin infections, circulatory issues, dermatitis, mosquito bites, bed bug bites, and allergic reactions can all be mistaken for spider bites. Without seeing the spider, it can be hard to confirm the source of the bite. You should always consult your medical provider.

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