Health Library
The Health Library is a collection of health and wellness resources created for learning and accessibility. Select a topic below for related health information or search for a topic in the search bar for more information on other medical conditions.
Spider Bites
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To avoid bites from spiders: Wear gloves if working in an area where spiders are likely to live. Avoid wood or rock piles and dark areas where spiders live. Look for spiders in low-lying webs in garages, in barbecue grills, around swimming pools,...
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Insect and spider bites often cause minor swelling, redness, pain, and itching. These mild reactions are common. They may last from a few hours to a few days. Home treatment is often all that's needed to relieve the symptoms of a mild reaction to common stinging or biting spiders and insects, such as fleas, flies, and...
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Bites and stings from insects (bees, wasps, yellow jackets) and spiders usually cause pain, swelling, redness, and itching at the site of the sting or bite. In some people, especially children, the redness and swelling may be worse and last up to a...
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Many insects, such as the following, cause mild reactions: Bedbugs. Kissing bugs. Chiggers. Fleas. Flies. Mites. Mosquitoes. Nonpoisonous spiders. Ticks. Scabies. Lice. For more information on lice, see the topic Body Lice, Head Lice, or Pubic Lice. Some insects are more likely than others to cause...
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What is a black widow spider? Black widow spiders ( Latrodectus mactans and Latrodectus hesperus) are found throughout the United States, Mexico, and southern Canada. A female black widow is much more likely to deliver more venom than a male spider. Female black widows are long-legged, shiny...
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What is a brown recluse spider? Brown recluse, violin, or fiddleback ( Loxosceles) spiders are about 0.5 in. (1.3 cm) long with a dark violin-shaped mark on the combined head and midsection (cephalothorax). They are found most often in the south-central part of the United States and live in hot, dry, abandoned...
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What is a black widow spider? Black widow spiders ( Latrodectus mactans and Latrodectus hesperus) are found throughout the United States, Mexico, and southern Canada. A female black widow is much more likely to deliver more venom than a male spider. Female black widows are long-legged, shiny...
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What is a brown recluse spider? Brown recluse, violin, or fiddleback ( Loxosceles) spiders are about 0.5 in. (1.3 cm) long with a dark violin-shaped mark on the combined head and midsection (cephalothorax). They are found most often in the south-central part of the United States and live in hot, dry, abandoned...
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Symptoms of a nonpoisonous spider bite may last from a few hours to a few days and are usually mild. Symptoms usually occur at the site of the bite and may include: Swelling. Redness. Pain. Itching. Home treatment is often all that is needed to...