Iran's schoolgirls were the targets of a deliberate, coordinated poisoning campaign
Where the evidence lands: UnprovenThat the wave of illnesses in Iranian girls' schools from November 2022 onward was not stress, coincidence, or mass psychogenic illness, but a deliberate, coordinated campaign, carried out or tolerated by hardline elements, to poison and terrorize schoolgirls into abandoning their education, in reprisal for the female-led uprising sweeping the country.
Believed by: Widely believed among Iranians and Iranian diaspora during the wave of illnesses from late 2022 into 2023
The full story
A strange smell, and a country already afraid
It usually began with an odor. Girls in a classroom would notice something they could not place, citrus, or chlorine, or rotten fruit, and within minutes some were dizzy, short of breath, nauseated, numb in the hands. The first case to draw national attention came at a school in Qom on 30 November 2022, when dozens of students were taken to hospital. Over the following weeks and months, hundreds of videos spread across Iranian social media: girls on stretchers, girls crying, parents massing outside school gates. Reporting eventually placed suspected incidents at girls' schools in most of Iran's provinces, with figures cited from the hundreds into the thousands. No one died, and no case was reported as critical.
None of this landed in a calm country. Two months earlier, the death in custody of Mahsa Amini had set off the largest woman-led uprising in the Islamic Republic's history, and the state had answered it with force. So when girls started falling ill, in girls' schools, during a revolt centered on women's freedom, a great many Iranians reached the same conclusion at once: someone was poisoning them on purpose, to scare them out of the classroom and back into line.
That is the claim this file rates: a deliberate, coordinated campaign to poison schoolgirls. It is a serious, widely held, and far from unreasonable suspicion. It is also, on the evidence that exists, unproven. The documented record, real illness, real fear, a real and evasive official response, is one thing. The rated claim about what caused it is another, and the gap between them is exactly where an opaque state made certainty impossible.
The case for a deliberate campaign
Take the suspicion at its strongest, because it rests on real things. The victims were, overwhelmingly, girls. The wave started in Qom, a center of religious conservatism, and it arrived precisely as the state was cracking down on women and girls across the country. If one wanted to imagine a message aimed at frightening female students out of public life, this is close to what it would look like.
For a moment, officialdom seemed to agree. In late February 2023 a deputy health minister, Younes Panahi, said the illnesses in Qom and Borujerd were not accidental and appeared intended to shut girls' schools. Days later the Supreme Leader, Ali Khamenei, called the poisonings, if deliberate, an “unforgivable” crime deserving the death penalty. The country's two most senior registers, a technical ministry and the Leader himself, had both treated an intentional attack as real.
And the reprisal reading fit a known pattern. Attacks on girls' education were not hypothetical in the region: neighboring Afghanistan had seen years of school poisonings and gas scares, and Iran itself had a history of acid attacks on women read as enforcement of dress codes. Against that backdrop, and against a government that had just shown it would use violence to police women's bodies, a campaign to terrorize schoolgirls did not require any exotic assumption. It required only that the state, or hardliners within its orbit, wanted the uprising's youngest women afraid. Many Iranians believed exactly that, and their belief was grounded, not paranoid.
The other explanation, and the science behind it
There is a competing account, and it is not a way of calling the girls liars. Mass sociogenic illness, also called mass psychogenic illness, describes genuine physical symptoms, fainting, breathlessness, nausea, headaches, that spread through a group without any toxic cause. The symptoms are real; the trigger is anxiety, not a poison. It has been documented for centuries, it clusters overwhelmingly in tight-knit groups under stress, and its single most common ignition point over the past hundred years is an unfamiliar smell. It tends to travel by line of sight and, in the modern version, by video: one person collapses, others see it, the wave moves.
Several of the reported features fit that profile: a strange odor, adolescent girls in schools, a nation under acute stress, symptoms that resolved without lasting harm, and rapid spread once the story was everywhere. Simon Wessely, a psychiatrist and epidemiologist at King's College London, saw the hallmarks of sociogenic illness. A University of Leeds toxicologist who reviewed blood tests from affected girls reported finding no toxins. The World Health Organization had reached a mass-psychogenic-illness verdict on a strikingly similar wave in Afghan girls' schools between 2009 and 2012, after investigators found no chemical agent.
But this explanation does not close the case either, and honest experts said so. Ali Arab, a statistician and epidemiologist at Georgetown University, called a purely psychogenic reading “absurd” given the scale and the volume of evidence. Two cautions matter. First, sociogenic illness and a real low-grade irritant are not mutually exclusive: a genuine stink-bomb or chemical in one school can seed a sociogenic wave in a hundred others. Second, “mass hysteria” has a long, ugly record of being deployed to dismiss the distress of women and girls, which is exactly why Iranians bristled when their government reached for it. That a label can be abused does not make it wrong; it does mean it cannot be asserted as a verdict without the evidence to back it, evidence that, here, no one could gather.
The opacity that left it unresolved
The reason this remains a genuine mystery, rather than a solved case filed under either heading, is that the one body able to investigate it was also the body least trusted to, and it behaved accordingly. Iran's official account did not merely change; it lurched. The cases were rumor and student stress. Then they were deliberate, aimed at closing girls' schools. Then they were a foreign “security plot” by Iran's enemies. Then, on 29 April 2023, the Intelligence Ministry announced there had been no poisoning by toxic substances at all, only mass hysteria and malingering stoked by hostile media. The state had announced more than a hundred arrests over an attack it would soon declare had never happened.
Around that shifting story, the machinery of secrecy did its work. Ali Pourtabatabaei, the Qom journalist who first documented the cases, was detained. Prosecutors moved against activists and others who questioned the official line. Riot police were reported at protests by parents; school staff were reportedly warned not to report new cases to the press. No verified toxicology was ever released to independent scientists, no scene was opened to outside investigators, and no suspect was ever publicly named and tried. Human-rights bodies, including Amnesty International and UN experts, condemned both the attacks and the state's failure to investigate them credibly.
The effect was to foreclose proof in every direction. Outsiders could not confirm a chemical agent, because they were never given samples they could trust. They could not rule one out either, for the same reason. They could not confirm a coordinated campaign, because the investigation that might have identified perpetrators was never transparent, and they could not confirm pure sociogenic illness, because the state that pronounced it had every incentive to and no credibility left. When the referee controls the field, hides the tape, and keeps changing the score, the honest reading is not to pick a winner. It is to say the truth was never established.
Why so many are sure it was poison
The conviction that this was a deliberate campaign is not a failure of reasoning; it is a rational response to a specific situation, one that also shows how certainty outruns evidence. Start with a state that had just spent months beating and jailing women in the streets. Against that record, the possibility that it would poison schoolgirls, or look away while others did, is not far-fetched, and people updated accordingly. When a government has genuinely done terrible things, the prior that it has done this one too is reasonable.
The official conduct then did the rest. Every evasion, every contradiction, every detained journalist reads, to an already distrustful public, as consciousness of guilt. A cover-up and an incompetent, defensive bureaucracy can look identical from the outside, and a population with cause to expect the former will see it. Add a vivid, shareable stream of videos, a phenomenon that spreads and confirms itself through the very act of being watched, and a regional memory of attacks on girls' schools, and the deliberate-poisoning conclusion becomes not just available but almost inescapable.
The trap is that all of this can be true and the specific claim can still be unproven. Reasonable suspicion, damning timing, and a lying government are grounds to demand a real investigation. They are not, by themselves, the investigation. The same opacity that makes the poisoning theory feel obvious is what prevents anyone outside Iran, or arguably inside it, from actually confirming it.
Where this lands
The documented core is not in dispute: thousands of Iranian schoolgirls reported sudden illness across many provinces from late 2022 into 2023, the distress and the hospital visits were real, the fear was real, and the state's response was evasive, punitive, and self-contradicting. What cannot be settled is the cause. The rated claim, a deliberate, coordinated campaign to poison girls out of school, is plausible, widely believed, and consistent with the timing, but it was never independently established. Neither was its rival, that the wave was essentially sociogenic. Reputable experts split, no credible toxicology was ever produced, and no perpetrator was ever named and tried.
So the verdict is unproven, and deliberately so. This is not the false balance of pretending two well-supported answers are equally strong; it is the honest recognition that an opaque authoritarian state made verification impossible and then declared the matter closed on its own say-so. To assert a confirmed poisoning campaign would claim knowledge no one outside the Iranian security apparatus has. To dismiss it all as hysteria would launder that same apparatus's least credible statement into fact. The truth is that we do not know, that Iranians were denied the transparent inquiry that might have told them, and that the not-knowing is itself a product of how the state chose to respond.
What's still unexplained
- No credible, independent toxicology was ever released. What chemical agent, if any, was involved in any of the incidents remains unestablished, because outside experts were never given verifiable samples or scene access.
- Whether any episodes were deliberate, and if so who was responsible (hardline vigilantes, state actors, copycats, or pranksters), was never adjudicated in any transparent trial. The 100-plus announced arrests led to no public prosecution.
- How much of the wave was sociogenic spread and how much, if any, involved a real irritant may be impossible to disentangle after the fact, given how the cases were documented and how quickly the official story changed.
- The full scale is itself uncertain: tallies ranged from hundreds into the thousands, drawn largely from social media and constrained state reporting, with no independent count possible.
Point by point
The claim: The pattern, overwhelmingly girls' schools hit across the country during a woman-led uprising, proves a coordinated campaign to punish and silence female students.
What the record shows: The pattern is real: reporting placed suspected incidents at girls' schools in most of Iran's provinces, and the timing amid the 'Woman, Life, Freedom' protests made a reprisal reading natural. A senior health official, Younes Panahi, even said early on that some cases were deliberate and aimed at closing girls' schools. But no perpetrator, organization, or motive was ever identified in any transparent proceeding; Iran announced over 100 arrests yet tried no one and named no attacker. A striking pattern is not, by itself, proof of a directed plot, and here the directing hand was never shown.
The claim: The girls were chemically poisoned; toxic gas was detected.
What the record shows: Officials gave contradictory accounts. One health official floated 'nitrogen gas'; others, and finally the Intelligence Ministry, said no toxic substance was found. A University of Leeds environmental toxicologist who reviewed blood-test results from affected girls reported no evidence of toxins. No chemical agent was ever publicly and credibly identified. Given how tightly Iran controlled the samples and the narrative, absence of a confirmed toxin does not prove nothing harmful was ever present; it does mean chemical poisoning was never established.
The claim: It cannot be psychological: hundreds of videos show girls genuinely, physically ill.
What the record shows: The symptoms were real, but that does not settle the cause. Mass sociogenic (psychogenic) illness produces genuine physical symptoms, nausea, breathlessness, fainting, with no toxic trigger, and typically spreads through tight-knit groups by sight, sound, and an unfamiliar smell. Psychiatrist Simon Wessely of King's College London saw hallmarks of it; statistician and epidemiologist Ali Arab of Georgetown called a purely psychogenic explanation 'absurd' given the scale and evidence. The World Health Organization had judged a similar wave in Afghan girls' schools (2009 to 2012) to be mass psychogenic illness. Experts stayed genuinely divided.
The claim: The government's own admissions prove a real attack took place.
What the record shows: Officials said mutually incompatible things over a few weeks: it was rumor and stress; then it was deliberate and aimed at girls' schools; then it was a foreign 'security plot'; then it was mass hysteria and malingering with no poisoning at all. A narrative that shifts this much cannot anchor a firm conclusion in any direction. The contradictions are themselves part of why the episode could never be independently verified.
The claim: Officials blamed stink bombs and pranks, so the whole thing was harmless mischief.
What the record shows: The Interior Ministry said some incidents involved 'harmless and smelly substances,' suggesting stink-bomb-style pranks or copycats. That may account for some episodes, but it was asserted without named culprits or public evidence, and it sits awkwardly beside thousands of reported hospitalizations. Families, teachers, and rights groups rejected it as a way to minimize the crisis. Like the other official framings, it was neither substantiated nor independently checkable.
Timeline
- 2022-09The death in custody of Mahsa Amini, detained by Iran's morality police, ignites months of nationwide, woman-led protests under the slogan 'Woman, Life, Freedom,' met by a violent state crackdown. This is the charged backdrop against which everything that follows is read.
- 2022-11-30The first widely reported case: dozens of schoolgirls in the religiously conservative city of Qom are taken to hospital after reporting a strange smell and sudden symptoms. A local journalist, Ali Pourtabatabaei, is among the first to document it.
- 2022-12 to 2023-02Similar episodes recur at schools in Qom and begin appearing elsewhere. Hundreds of videos circulate of girls reporting burning throats, nausea, headaches, and numbness. Officials initially wave the reports away as rumor, underlying illness, or anxiety.
- 2023-02-26Deputy Health Minister Younes Panahi says the illnesses in Qom and Borujerd were not accidental and appeared aimed at shutting girls' schools, an apparent official acknowledgment of intent that authorities would later walk back.
- 2023-03-01The wave spreads sharply to Tehran and many provinces. Reporting describes suspected incidents at dozens, then more than 200, girls' schools across most of Iran's provinces. No deaths and no critical cases are reported.
- 2023-03-03President Ebrahim Raisi frames the episode as a security plot by Iran's enemies to sow chaos and fear. Officials increasingly blame foreign adversaries and 'dissident media' rather than any domestic actor.
- 2023-03-06Supreme Leader Ali Khamenei calls the poisoning of schoolgirls, if deliberate, an 'unforgivable' crime that should carry the death penalty, publicly acknowledging the crisis after weeks of official dismissal.
- 2023-03-07 to 03-11Authorities announce more than 100 arrests 'in connection with' the poisonings, some accused of ties to foreign-based media, but name, indict, and try no one. Journalists and family members who press for answers are detained or threatened.
- 2023-04-29Iran's Intelligence Ministry concludes there was no actual poisoning by toxic substances, attributing the cases to stress, mass hysteria, and malingering, and again blaming enemies for stoking fear. The reversal, from arrests over an attack to a declaration that no attack occurred, satisfies almost no one.
Unproven. Thousands of Iranian schoolgirls really did fall ill, and the fear was real. But whether the wave was a coordinated poisoning campaign, scattered low-grade chemical mischief, or mass sociogenic illness (or some mix) was never independently established. Iranian officials gave contradictory accounts and blocked outside verification; reputable experts remained split. On the record available, no explanation is confirmed.
Reviewed by The Conspiratory Editors · Last reviewed July 24, 2026 · How we rate
Sources
- 1.Iran: Millions of schoolgirls at risk of poisoning, Amnesty International (2023)
- 2.Are Iranian schoolgirls being poisoned by toxic gas?, BBC News (2023)
- 3.Suspected poisonings in Iran sicken hundreds of schoolgirls, NPR (2023)
- 4.What explains mysterious poisonings of schoolgirls in Iran?, Al Jazeera (2023)
- 5.Iran president blames foreign enemies for schoolgirl poisonings, Al Jazeera (2023)
- 6.Iran: Deliberate poisoning of schoolgirls further evidence of continuous violence against women and girls, UN Office of the High Commissioner for Human Rights (2023)
- 7.Iranian Media Reports Hundreds of Schoolgirls Poisoned, Human Rights Watch (2023)
- 8.Schoolgirl poisonings: Iran arrests more than 100 people, CNN (2023)
- 9.Suspected Iran schoolgirl poisonings: What toxicologists know so far, Al Arabiya English (2023)
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