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Signs & Symptoms of a Venomous Spider Bite

People fear spiders, but often without reason. Spiders may look creepy and dangerous, but the reality is that most spider bites pose no harm whatsoever. In the United States, most poisonous spider bites come from two sources: the black widow and the brown recluse. Those are poisonous to anyone and most dangerous to children. Additionally, for some people, spider bites may produce acute and life-threatening allergic reactions.
  1. Black Widow

    • When a black widow strikes, you may not even realize you've been bitten. When you do feel something, it feels like a pin-prick, according to the Mayo Clinic. First symptoms include mild swelling and red marks. Several hours later, the bitten area will hurt intensely and begin to stiffen. This is accompanied by chills, fever, queasiness, vomiting and severe abdominal pain, according to the Mayo Clinic. These bites are serious but rarely fatal.

    Brown Recluse

    • A brown recluse bite feels like a mild sting, according to the Mayo Clinic. Within eight hours, the bitten area will turn red and become severely painful. Brown recluse bites also produce a fluid-filled blister, which subsides and then forms a deep ulcer. Brown recluse bites may also cause fever, rash, nausea and fatigue. Brown recluse bites can kill, more often in children than in adults.

    Allergic Bites

    • Many spider bites carry no actual venom, but they can produce severe allergic reactions. Depending on a person's disposition to allergies, spider bites may cause a life-threatening reaction called anaphylaxis. Its symptoms set in within minutes or seconds, and they include abdominal pain, wheezing, diarrhea, trouble breathing, light-headedness, hives, nausea, vomiting, heavy heartbeat, redness and slurred speech.


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