Rare disclosure · Free check · By an anesthesiologist
Stung by a scorpion — ever? Your anesthesiologist wants that sentence.
It sounds like folklore, but it's in the anesthesia literature: people with a past scorpion sting in whom spinals and numbing injections worked poorly — sometimes years later. The evidence is thin; the disclosure costs nothing.
Quick answer
Published case reports — mostly from India and other regions where scorpion stings are common — describe spinal anesthesia and local anesthetics working poorly in some people with a past scorpion envenomation, possibly because the venom acts on the same nerve channels local anesthetics block. The evidence is limited and most stung people have normal blocks — so a past sting is not a reason to avoid a spinal, just a reason to say one sentence: "I was stung by a scorpion in [year]." Your anesthesiologist will test the block properly and have plan B ready.
Quick check — tick what applies to you:
What the case reports actually say — honestly
Indian anesthesia journals have repeatedly reported patients with a history of scorpion sting whose spinal anesthesia failed or was patchy despite technically perfect injections, and case series where resistance to local anesthetic infiltration was documented across dental work and minor surgery. The proposed mechanism is plausible — scorpion venoms act on nerve sodium channels, the same target local anesthetics block — but the evidence is case-level: no controlled study, no way to predict which stung patients are affected, and many people with past stings block completely normally.
So the honest position is the one your anesthesiologist takes: a past sting changes nothing about whether you can have a spinal — it changes how carefully the block is tested before the surgeon starts, and how ready the team is to top up or convert to a general anesthetic. Which is exactly why the one-sentence disclosure matters. Add it to your disclosure card, and if you're choosing between techniques, see epidural vs spinal.
Frequently asked questions
Can a scorpion sting really make spinal anesthesia fail?
There are published case reports and small series — mostly from India, where scorpion envenomation is common — describing patients with a past sting in whom spinal anesthesia or local anesthetic injections worked poorly or not at all, sometimes years later. The proposed explanation is that scorpion venom acts on the same nerve sodium channels that local anesthetics block. This is low-certainty evidence: no large study proves it, and plenty of people with past stings have normal spinals. Treat it as a flag worth raising, not a rule.
Should I still have a spinal if I've been stung by a scorpion before?
Usually yes — a past sting is not a ban on spinal anesthesia. What changes is the anesthesiologist's plan B: they'll test the block carefully before surgery starts, be quicker to top up or convert to general anesthesia if it's patchy, and won't be caught by surprise. That's the entire point of telling them.
What exactly should I tell my anesthesiologist?
One sentence: 'I was stung by a scorpion in [year] — I've read local anesthetics and spinals can work poorly in some people after that.' Include whether it was a serious envenomation (hospital admission, antivenom) versus a minor sting, and whether any dental or local anesthetic has seemed weak for you since. Then let them plan.
Does this apply to dental anesthesia and numbing injections too?
The same case literature includes reports of local anesthetic infiltration (including dental) working poorly after scorpion envenomation. If the dentist's injections have repeatedly 'not worked' on you since a sting, that's worth mentioning both to dentists and to your anesthesiologist — resistance to local anesthetics from any cause is useful information before surgery.
I was stung years ago — does it still matter?
The reported cases include failures years after the sting, so mention it regardless of how long ago it happened. It costs one sentence, and the worst case is that your anesthetist smiles, notes it, and everything works normally.