Snake & Insect Bites in the Backcountry: First Aid That Actually Works

Most snake and insect bites in the backcountry are frightening but manageable. A few are genuine emergencies. The difference between a good outcome and a bad one is almost never a remedy in your pack — it is how quickly you recognise the serious cases and how calmly you get the person to definitive care. This guide follows current wilderness-medicine guidance (Wilderness Medical Society, American Red Cross, CDC). It is not a substitute for medical advice or for an emergency call.

Venomous snakebite: what to do

In North America the venomous snakes you are likely to meet are pit vipers — rattlesnakes, copperheads and cottonmouths — plus coral snakes in the South. About a quarter of pit-viper bites are “dry” (no venom injected), but you cannot tell in the field, so treat every bite as if venom was delivered.

1. Move away from the snake — a few metres is enough. Do not try to catch or kill it; a photo from a safe distance helps identification, but is not required for treatment.
2. Call 911 or send for help. Note the time of the bite.
3. Keep the person calm and as still as practical. Panic and exertion speed venom spread.
4. Remove rings, watches, bracelets and tight clothing from the bitten limb before it swells.
5. Position the bitten limb at roughly heart level and splint it loosely if you can, to limit movement.
6. Mark the leading edge of the swelling with a pen and write the time next to it. Repeat every 15–30 minutes — this tells the hospital how fast the envenomation is progressing.
7. Wash the wound gently with clean water and cover it with a clean, dry dressing.
8. Get to a hospital. If rescue is not coming and you must self-evacuate, walk out slowly with frequent rests; the risk of staying put with no help usually outweighs the risk of moving.

What not to do

These older “remedies” make outcomes worse and are no longer recommended by any wilderness-medicine body:

• No cutting the wound, no suction (by mouth or with a kit), no “venom extractors”.
• No tourniquets or tight constriction bands.
• No ice, no immersion in cold water, no heat.
• No electric shock, no electrical or “microcurrent” devices.
• No alcohol, caffeine or stimulants. No aspirin, ibuprofen or other NSAIDs — pit-viper venom already interferes with clotting, and these drugs increase bleeding.
• No herbal, homeopathic or “drawing” treatments in place of medical care. Nothing you can carry neutralises venom; only antivenom does. Anything that delays the trip to hospital costs time you may not have.

Bee, wasp and hornet stings

• Scrape the stinger out sideways with a fingernail or card as soon as possible (don’t squeeze it).
• Wash with soap and water; apply a cold pack wrapped in cloth for 10–20 minutes at a time to limit swelling.
• An oral antihistamine helps itching and local swelling; a pain reliever is fine for stings (unlike snakebite).
• Multiple stings (dozens), stings inside the mouth or throat, or any sign of anaphylaxis: call 911 and use epinephrine if available.

Spider bites, ticks and mosquitoes

• Spiders: clean the bite, cold pack, watch it. Suspected black widow or brown recluse bites — severe cramping pain, a spreading dark or blistering lesion, fever — need a doctor the same day.
• Ticks: remove promptly with fine tweezers, gripping close to the skin and pulling straight up — no heat, petroleum jelly or twisting. Clean the site and note the date. A spreading rash, fever, joint pain or fatigue in the following weeks needs a doctor and a mention of the tick.
• Mosquitoes and flies: wash, cold pack, antihistamine for itching. Watch for signs of infection (increasing redness, warmth, pus, red streaks) — these need medical care.

Prevention that actually works

• Watch where you put hands and feet: look before stepping over logs and rocks, and never reach into crevices or brush you can’t see into.
• Boots and long trousers stop most snake fangs and most insect bites. Loose, breathable natural fibers — wool socks, canvas trousers, a merino bandana — keep you covered without overheating.
• Use an EPA-registered repellent (DEET, picaridin, oil of lemon eucalyptus) where ticks and mosquitoes are dense, and check for ticks at the end of every day.
• Shake out boots, sleeping bags and packs before use in snake or spider country. Sleep off the ground in a tent with the door zipped.
• Carry a satellite communicator or PLB when you leave cell coverage; if anyone in the group has a known severe allergy, they carry two epinephrine auto-injectors and everyone knows where they are.

What belongs in a backcountry bite kit

Fine-point tweezers · a marker pen · sterile dressings and a roller bandage · an elastic wrap and something to splint with · antihistamine tablets · acetaminophen (paracetamol) for pain · epinephrine auto-injectors if anyone is allergic · your Poison Control number written down · a charged phone or satellite messenger. See our day-hiking checklist for the rest of the kit.

Medical disclaimer: this article is general first-aid information for outdoor travellers and is not medical advice. Envenomation is a medical emergency — call 911 or your local emergency number and follow the instructions of medical professionals. Guidance summarised from the Wilderness Medical Society practice guidelines on pit viper envenomation, American Red Cross first-aid guidance and CDC recommendations; last reviewed August 2026.