Most spider bites are harmless and go away in a few days.
But in some cases, they can lead to serious health issues - especially if a venomous spider was involved or if you're allergic.
Here are the key signs that your spider bite might require medical attention.
You were bitten by a black widow or brown recluse
If you know the bite came from a black widow or brown recluse, seek emergency medical care immediately.
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These spiders have venom that can cause serious reactions and even long-term tissue damage.
Your symptoms are getting worse over time
Pain, swelling, or redness that intensifies after 1–2 days may indicate infection or a venomous bite.
Watch for signs like expanding wounds, fever, or blistering - these are not normal and require medical care.
You’re having trouble breathing
Difficulty breathing is a major red flag and could signal an allergic reaction to the spider’s venom.
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This can quickly turn into a life-threatening emergency like anaphylaxis.
Your heart is racing
A rapid heartbeat can be part of a severe allergic reaction or a sign that your nervous system is reacting to the spider's venom, especially in the case of a black widow bite.
You have muscle cramps or stomach pain
Venom from a black widow can cause severe muscle cramps, especially in the chest or abdomen.
These symptoms usually appear within an hour and require immediate treatment.
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The bite site turns blue or sunken
Brown recluse venom can destroy skin tissue, leading to necrosis. A blue, sunken wound that grows over time is a strong indicator of this and should be examined by a doctor.
You develop flu-like symptoms
Fever, vomiting, and fatigue after a spider bite are signs that your body is reacting systemically to the venom. This isn’t normal and shouldn’t be ignored.
You see blisters or open sores
If the bite begins to blister or develop into an open wound, it may be infected or a sign of a venomous spider bite.
Medical attention is often needed to prevent further complications.
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You feel numbness or tingling
Venom can affect nerve tissue, especially with black widow bites. Tingling, numbness, or weakness around the bite may signal a more serious reaction.
You know you’re allergic to spider venom
Even a bite from a non-dangerous spider can cause a severe reaction if you’re allergic.
Symptoms like swelling in your throat or eyes, severe itching, or lightheadedness may indicate anaphylaxis and require emergency treatment.
This article is based on information from Healthline.com.
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