In an age when information travels faster than ever, the line between fact and fiction has become dangerously thin—especially when it comes to health. A new report from the London School of Hygiene & Tropical Medicine has pulled back the curtain on just how serious this problem has become in the UK. Titled Health Misinformation: Public Perceptions of Threat to the UK, the study draws on responses from 2,110 adults in a nationally representative survey conducted by Survation in September 2026. The numbers are sobering. One in five young adults say they have made a medical or lifestyle decision they later regretted after believing false claims. Even more striking, more than a third of people aged 18 to 24—38 percent—personally know someone who suffered direct physical harm because of misinformation, such as contracting a vaccine-preventable disease or delaying urgent medical care. This isn’t just an abstract worry or a fringe online issue. It is happening in real lives, in real families, and the report makes clear that it is no longer possible to dismiss health misinformation as a nuisance we can simply scroll past.
The findings are especially troubling when you consider how easily and quickly these falsehoods spread through everyday life. For young adults, the consequences are not hypothetical. They are the ones making decisions about vaccinations, mental health support, diets, and treatments—often before they have the experience or confidence to question what they see online. Social media was identified as the main source of bad health information, cited by 61 percent of those who had encountered misleading content. That is a staggering majority, but it is far from the only channel. Blogs and websites came next at 30 percent, followed by informal circles of friends and family at 27 percent. Traditional media accounted for 26 percent, and workplace peers for 20 percent. What this reveals is that misinformation is not just a digital problem. It travels through dinner table conversations, group chats, workplace watercooler talk, and trusted personal networks. Sometimes it is shared with the best intentions, by a worried parent or a well-meaning friend, which makes it all the more difficult to recognise and resist. When the people we trust are the ones passing on questionable health advice, the usual defences—critical thinking, fact-checking, common sense—can quickly go out the window.
The report also shines a light on the specific kinds of misinformation that are gaining traction. In the past six months, the most commonly seen false claims have centred on vaccines, accounting for 24 percent of encounters. Close behind were claims about dietary supplements and off-label weight-loss injections, making up 21 percent. Climate-related health claims followed at 18 percent, and mental health therapies at 16 percent. These are not harmless conspiracy theories floating around the edges of the internet. They tap into real anxieties about bodily autonomy, weight, fear of needles, environmental concerns, and the psychological pressures of modern life. What makes them especially persuasive is that they are often dressed up in the language of wellness and self-care. They promise quick fixes, natural alternatives, or hidden truths that official sources are supposedly hiding from you. And now there is another player in this landscape: generative artificial intelligence. Nineteen percent of respondents said they had encountered bad health advice from AI chatbots. This is a particularly worrying development, because these tools are often designed to sound confident and authoritative, even when they are completely wrong. A person asking about symptoms or treatments late at night might easily be misled by a polished, human-sounding response generated by an algorithm with no medical training, no empathy, and no accountability.
The damage caused by this flood of misinformation goes far beyond individual regrets. Around 60 percent of people surveyed said they believe it drives others to purchase unverified therapies, erodes trust in NHS clinical services, and encourages refusal of evidence-based treatments. That last point is crucial. When someone loses trust in medical institutions, they don’t simply stop believing one claim—they begin to question everything. They may avoid seeing a doctor when they should, follow unproven treatments instead of prescribed care, or encourage others in their community to do the same. The ripple effects are felt not just in personal health outcomes but across the entire healthcare system. It is no wonder, then, that nearly half of respondents—47 percent—said they want stronger government intervention. Importantly, they are not asking for censorship or heavy-handed control. The support focuses on practical measures: legislation to penalise commercial actors who profit from fraudulent health advice, public health literacy programmes, and mandatory warning flags on social platforms. There appears to be a growing recognition that while individual critical thinking matters, the problem is too big and too systematically amplified for individuals to solve alone. The same people who might once have valued complete freedom of information are now saying, in effect, that we need better safeguards, clearer accountability, and stronger support from the institutions that shape what we see and believe.
Professor Liam Smeeth, Director of the LSHTM, captured the gravity of the situation in his commentary on the report. He noted that with a fifth of UK adults saying they have made a health decision they regret based on misinformation—rising to a third among those under 34—and a fifth saying they know someone who has suffered serious harm, the problem can no longer be ignored. He spoke powerfully about the invisible nature of this threat: in a world of algorithms and closed networks, both online and offline, we often have no idea what false or misleading health information our families, friends, and neighbours are seeing. What makes this so unsettling is that misinformation does not have to convince everyone to be dangerous. It only has to convince a small number of people, and in a world where we are all increasingly isolated in our own information bubbles, that number can quietly grow. Smeeth stressed that health misinformation is sometimes dismissed as a fringe problem, but the evidence now suggests otherwise. False claims in our feeds, in our conversations, and in the content we consume are seriously damaging the nation’s health. He hopes the findings will push institutions across the UK to think harder about what more they can do to help people recognise and resist harmful misinformation, while also ensuring that accessible, trustworthy health information is available to those who need it.
Of course, the report is not without its limitations. The findings are based on self-reported survey responses, which means people’s recollections of encountering misinformation and its effects may not always be perfectly accurate. In addition, sample sizes outside England were relatively small, so regional comparisons should be made with caution. But even taking these limitations into account, the picture that emerges is clear and troubling. Misinformation is not a niche issue confined to the fringes of society. It is shaping decisions, damaging lives, and eroding trust in some of the most important public institutions we have. The report should be a wake-up call to everyone—policymakers, healthcare professionals, tech companies, educators, and ordinary citizens. We all have a role to play. That means being more thoughtful about what we share, more willing to question the content that feels true, and more committed to supporting one another in finding reliable health information. It also means recognising that the problem is not simply about bad actors online, but about a broader environment in which confusion can flourish. If there is one message to take away, it is this: our health is too important to be left to algorithms, influencers, or well-meaning but misinformed friends. By taking misinformation seriously, and responding with both compassion and evidence, we can begin to rebuild the trust that is so essential to a healthy society.