What to do after a snake bite
Most of what people remember about snakebite first aid comes from films and every bit of it makes the outcome worse. The correct protocol is short, and most of it is about getting to a hospital without doing anything else on the way.
Free, staffed twenty-four hours, and the service your emergency department will ring anyway. Call from the car. Call it even for a bite you think was harmless; talking to a toxicologist costs nothing and settles it.
Get out of range.
Move away from the snake before anything else. A second bite while photographing the first one is a documented way this goes wrong. Do not try to catch or kill it; the hospital does not need the animal.
Rings, watch, boots off.
Anything that will trap swelling comes off in the first minutes, while it still can. Swelling from a pit viper bite moves faster than most people expect.
Keep the limb still.
Immobilise the bitten arm or leg and keep it roughly at heart level. Sit down, stay calm, and stop walking on a bitten foot.
Mark the swelling and the time.
Draw a pen line at the leading edge of the swelling and write the time beside it. Repeat every fifteen minutes. This single act gives the hospital the one measurement it needs most.
Go to a hospital. Be driven.
An emergency department, not an urgent care clinic. If you are alone and symptoms are progressing, call 911 rather than driving yourself.
Five things that make it worse.
A tourniquet or a tight band.Concentrating venom in one limb converts a survivable systemic dose into a destroyed hand. Tennessee Poison Center lists ligatures and tourniquets under what not to do.
Cutting and sucking.It removes no meaningful venom, adds a wound and an infection, and cuts tendons. Extractor pumps have the same evidence base, which is none.
Ice or heat.Both add tissue damage on top of tissue damage already underway. The limb wants to be still, not cold.
Electric shock.Still circulates, still useless, still on the poison center’s list of things not to do.
Alcohol, or waiting it out.Alcohol affects the assessment and the clotting. Waiting to see how bad it gets removes the window in which the decision is easy.
What happens next.
Roughly a quarter of pit viper bites are dry, with no venom injected at all, and there is no way to tell from outside which quarter. That is why everyone is observed and not everyone is treated.
Marking and bloods.
The bite is marked, the swelling margin measured, and blood drawn for clotting studies and platelets. Expect the limb to be elevated and the measurements repeated on a schedule.
The antivenom decision.
Antivenom is given for swelling that keeps progressing, for abnormal clotting, or for systemic signs. It is not automatic, and most copperhead bites in Tennessee are managed without it.
Ruling out a dry bite.
A minimum observation period separates a dry bite from a slow one. Leaving early against advice is how a manageable envenomation becomes a surgical problem.
Recurrence and wound care.
Clotting can drift days after antivenom, and the wound can worsen after discharge. New bruising, bleeding gums, dark urine, fever or spreading redness is a same-day return.
Function, not just healing.
Swelling and stiffness in a bitten hand or foot can run for weeks. Ask about physiotherapy rather than waiting for it to resolve on its own.
Between 7,000 and 8,000 people are bitten by venomous snakes in the United States each year, and about five die. The copperhead accounts for more bites than any other American species and almost none of the deaths. What the bite statistics show most consistently is the circumstance: the majority happen to people who were trying to kill, move or handle the snake. Leaving it alone is the whole of the prevention strategy.
The species matters to the hospital less than most people assume, since both venomous snakes here are pit vipers and the treatment is the same, but it matters to you afterwards, and it matters to the next person who walks that path. Once you are safe, the Identify page and the species list are there. Never go back for a photograph.
Pack it. Print it. Pass it on.
Most snakes killed in Williamson County are killed by someone who could not name them. Send this to anyone who gardens, hikes, keeps a woodpile, walks a dog off the greenway, or has a teenager who reaches into things. That is most of the county.
Sources
Medical disclaimer. This field guide is general educational information, not medical advice, and is no substitute for professional diagnosis or treatment. Any bite from a copperhead or a timber rattlesnake is a medical emergency: go to an emergency department, and call the Tennessee Poison Center at 1-800-222-1222 on the way. In an emergency, call 911. Identification disclaimer. No photograph identifies a snake with certainty, and this guide will not make anyone a herpetologist. When the answer matters, keep your distance and send a photograph to someone who does this for a living.