Insect Bites and Stings

Most insect bites are harmless and cause only minor swelling or itching. But if you’re allergic to insects such as wasps or bees, a sting can cause a life-threatening allergic reaction. The venom (poison) from scorpions and certain spiders can also be deadly. Knowing when to seek emergency care could save your life.

The black widow (top) and brown recluse (bottom) are two poisonous spiders found in the United States.

When to Go to the Emergency Room (ER)

Call 911 immediately for any:

• Scorpion sting.

• Bite from a black, red, or brown widow spider or brown recluse spider.

• Signs of an allergic reaction. These include: hives; swelling of your eyes, lips, or the inside of your throat; trouble breathing; and dizziness or confusion.

What to Expect in the ER

• If you’re having trouble breathing, you’ll be given oxygen through a mask or be put on a breathing machine.

• You may receive antivenin (a substance that reverses the effects of poison) for some spider bites and scorpion stings. Because antivenin can sometimes cause other problems, your doctor will weigh the risks and benefits of this treatment.

• Steroids such as prednisone are often used to treat allergic reactions. In many cases, your doctor will prescribe an antihistamine to help relieve itching.