All bite guides

What happens after a black widow bite?

Female black widows are shiny black with a red hourglass underneath. The bite may feel like a pinprick, followed by muscle pain and cramping that can spread.

AI-generated field guide image of a black widow spider
AI-generated visual reference, not a real patient photo.

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What it looks like

  • Two tiny fang marks and mild redness
  • Muscle cramps in belly, back, or chest within an hour

What to do

  • Wash, apply cold, and stay calm
  • Call Poison Control at 1-800-222-1222

See a doctor if you notice

  • Spreading muscle pain or cramping
  • Sweating, nausea, or high blood pressure
  • Any bite in a child or older adult

Trouble breathing, face or throat swelling: call 911 now.

Other bite guides

Educational information only, not a diagnosis. BiteID is in alpha testing.