The laughter epidemic in Tanzania raised many questions, but scientists found an explanation for this strange case as well
On January 30, 1962, at a boarding school in the village of Kashasha in Tanzania, three schoolgirls suddenly started laughing right in the middle of a lesson. There was no joke, and the girls couldn’t stop. Over the next year and a half, this strange outbreak affected about a thousand people, forced 14 schools to close, and left doctors baffled. There was no infection or poisoning, yet the symptoms were absolutely real.
The Laughter Epidemic in Tanzania in 1962
According to Atlas Obscura, it all started in a small girls’ school on the shores of Lake Victoria. Three students suddenly began laughing uncontrollably, without reason and without the ability to stop. This was not a brief episode: the fits recurred and lasted for hours or even days.
The laughter quickly spread among other students. By March 18, 1962, the episodes had affected 95 of the school’s 159 students, making classes impossible. The school was closed. But the story didn’t end there — it was only gaining momentum.
When the students were sent home, bouts of laughter began appearing in their villages. In April and May, the outbreak hit the village of Nshamba, roughly 90 kilometers from Bukoba. There, 217 residents — mostly young people — were affected over 34 days. In June, the epidemic reached another girls’ school, Ramashenye, where 48 students developed symptoms. The wave leapt from one settlement to another like a wildfire.
Consequences of Prolonged Laughter
The name “laughter epidemic” itself is misleading, as if people were simply laughing non-stop. In reality, things were much worse.
In addition to uncontrollable laughter, those affected experienced:
- sudden crying;
- panic attacks and anxiety;
- fainting;
- breathing problems;
- pain in various parts of the body;
- skin rashes;
- aimless restlessness and agitation.
For some people, episodes lasted from several hours to 16 days. People were not having fun — they were suffering. The laughter was not joyful but compulsive and exhausting, like a nervous tic that could not be controlled. However, no deaths were recorded.
In total, the epidemic affected about a thousand people, led to the closure of 14 schools, and lasted approximately 18 months. All affected settlements were within a 160-kilometer radius of the city of Bukoba.
Was the Laughter Epidemic a Disease or a Psychosis?
Doctors, of course, first looked for the most realistic cause: an infection, a toxin in food or water, or some environmental factor. But numerous examinations and tests revealed nothing — no virus, bacterium, or poison that could link all the cases together.
Doctors unsuccessfully tried to find a physical cause for the outbreak
Gradually, researchers came to an agreement: they were dealing with a mass psychogenic illness — when emotional tension spreads within a group and manifests as very real physical symptoms, even though there is no pathogen. And there is an important nuance: people didn’t just think they were feeling unwell — they actually were unwell. The pain, fainting, and shortness of breath were all real. Only the trigger was not a virus, but stress.
A simple analogy: remember how before an important presentation you might feel nauseous, dizzy, or have a racing heart, even though you are physically healthy. That is the body reacting to psychological stress. Mass psychogenic illness works on a similar principle, except it spreads among a group of people.
Why Laughter Infected Entire Villages
To understand why the epidemic was even possible, you need to look at the context. Tanganyika had gained independence from Britain very recently — on December 9, 1961 — just seven weeks before the outbreak began. For the young nation, it was a time of hope but also enormous uncertainty.
The missionary schools inherited from the colonial system operated under strict rules. The students were separated from their families, lived under rigid discipline, and faced a conflict between the traditional culture of their families and the new rules at school.
Scientists explained that mass psychogenic illness is highly likely to strike people who cannot influence their difficult situation. It is the body’s way of telling those around it that something is wrong when there are no other means to express suffering.
A village near Lake Victoria, East Africa
This is precisely why the epidemic did not spread like the flu — through the air — but through social connections. As soon as a few girls burst into laughter, others watched, became frightened, and their bodies, without any conscious consent, repeated the same reaction. In tight-knit communities where everyone knows each other, such a chain of transmission hits harder than any virus.
Why Mass Psychogenic Illness Is Not Made Up
There are many myths surrounding mass psychogenic illness. The main one is that it’s “made up” or “faking.” That is not the case. Experts emphasize that the symptoms are absolutely real — people do not consciously control them. It is not weakness of will or a mental disorder in the conventional sense.
Mass psychogenic illness occurs in modern times as well. Psychogenic outbreaks have been documented in schools in England, at factories in the United States, among children in Kosovo and Afghanistan, and in monasteries of medieval Europe.
The most famous predecessor of the Tanganyikan epidemic is the dancing plague of 1518 in Strasbourg, when hundreds of townspeople danced in the streets for days and weeks, unable to stop. At the time, Strasbourg was suffering from famine and disease, and according to the most widely accepted theory by historian John Waller, the dancing was a form of mass psychogenic disorder triggered by extreme stress.
If you bring all these stories together, several common details stand out: a confined environment — a school, factory, monastery, or small community; a high level of stress or uncertainty; an almost complete absence of legitimate ways to speak out; and mostly young people and women among those affected. And also how quickly it all spreads through visual contact and shared anxiety.
At the same time, research shows that there is no special predisposition to mass psychogenic illness — under certain circumstances, it can happen to anyone.
What Scientists Know About Mass Psychoses
The case in Tanganyika remains one of the most thoroughly documented episodes of mass psychogenic illness. It clearly demonstrates how tightly body and mind are linked and how powerfully emotions transfer from one person to another.
In this story, laughter ceased to be a sign of joy and turned into a distress signal. The girls and adults were not laughing because they were happy — they were trapped in a chain reaction that could not be broken by willpower alone.
In the era of social media, when anxiety and panic spread even faster than in the villages of 1960s East Africa, the lessons of Kashasha are more relevant than ever. Scientists continue to study psychogenic epidemics, and the better we understand them, the greater our chances of recognizing and stopping such outbreaks in time — before they spiral out of control.
