5G conspiracy theories broadly fall into two camps. The first claims that 5G wireless signals cause direct health harm, including cancer and immune system damage. The second, which emerged during the COVID-19 pandemic, alleges that 5G technology is connected to the coronavirus outbreak3. Some variants claim 5G radiation caused COVID-19 directly, while others argue COVID-19 was fabricated as a cover story for 5G-related illness3. Both strains share a distrust of telecommunications companies, government regulators, and mainstream science.

The theories spread through Facebook groups, YouTube videos, Twitter hashtags, Change.org petitions, and conspiracy-oriented websites. Despite repeated debunking by scientists, journalists, and fact-checkers, the claims motivated real-world violence. Arson attacks hit cell towers in at least five countries during the spring of 20202.

As memes, 5G conspiracy theories became fodder for both sincere believers sharing pseudo-scientific graphics and ironic posters mocking the claims. The ironic side of the meme landscape turned the conspiracy's logic against itself, attributing everything from stubbed toes to bad weather to nearby 5G towers.

The 5G conspiracy theories drew debunking coverage from the New York Times1, Snopes4, the Guardian6, and RNZ2, among many other outlets. Academic researchers published peer-reviewed studies analyzing the misinformation as a case study in "digital wildfires," a category the World Economic Forum had placed among the top global risks of the 21st century3.

The practical damage was real. Telecommunications companies in multiple countries reported infrastructure damage from arson, with the attacks threatening connectivity for emergency services during a health crisis2. The episode became a textbook example for researchers studying how pre-existing conspiracy communities can rapidly absorb and amplify new crises, creating misinformation events far more dangerous than their individual components3.

The conspiracy's intersection with COVID-19 misinformation also changed how platforms and governments approached content moderation. The speed at which online claims translated into physical attacks on infrastructure made the 5G-COVID wildfire a frequently cited case in discussions about the real-world consequences of misinformation.

The transformation from niche concern into global crisis happened in January 2020, when COVID-19 entered public awareness. On January 21, 2020, the first known tweet linking 5G to the coronavirus appeared: "China is 5G now & working toward 6G. Wireless radiation is an immunosuppressor. Conincidence?"3. The tweet got little reaction initially, but similar messages appeared over the following days and weeks. Researchers who analyzed the event found that the idea grew steadily for roughly ten weeks before erupting into real-world action3.

The 5G-COVID merger drew from pre-existing anti-wireless sentiment but created something new and more dangerous. The misinformation took multiple contradictory forms. Some claimed 5G radiation directly caused COVID-19 symptoms, while others argued COVID-19 was entirely fabricated to distract from 5G-related illness3. The contradictions didn't slow the spread. As the New York Times noted at the time, conspiracy theories about the virus "replaced a mindless virus with more familiar, comprehensible villains," giving "a senseless tragedy some degree of meaning, however dark"2.

Videos played a larger role than tweets in amplifying the conspiracy. Researchers studying the event as a "digital wildfire" found that YouTube content was a major driver, and that the misinformation was what they called a "complex digital wildfire," not traceable to a single viral post but instead built from many messages across platforms combining into one massive event3. Commercial interests helped fuel it: sellers of anti-5G products, EMF-blocking devices, and alternative health supplements had financial motivation to keep the narrative alive3.

The real-world fallout hit hard in April 2020. Arson attacks targeted cell towers in the UK, Ireland, the Netherlands, Cyprus, and New Zealand3. New Zealand saw 10 attacks in Auckland alone, with four more in Wellington and Northland over a six-week period2. The New Zealand Telecommunications Forum issued a public plea for vigilance. Vodafone's Tony Baird called the attacks "infuriating," noting they could reduce mobile and internet coverage in affected areas2. Spark's Mark Beder stressed the cruel irony of attacking communications infrastructure during a pandemic: "A disruption to mobile connectivity can put New Zealanders at risk by cutting off access to critical services like 111"2.

Inside anti-5G Facebook groups, the response to the arsons was openly celebratory. Members shared encouragement and instructions for further attacks, with some posts including incitement to violence against political leaders2. One New Zealand journalist who had appeared in a Spark 5G commercial described receiving a flood of abusive messages, with people telling him he was "partially responsible" for the future deaths of their children2.

The scientific consensus stood firmly against the conspiracy's claims. The World Health Organisation stated that "no adverse health effects have been established as being caused by mobile phone use" based on two decades of research involving many studies6. The 13-country Interphone study, examining over 5,000 brain tumour patients, concluded there was "no increase in risk of glioma or meningioma" with mobile phone use6. A Danish cohort study following 358,403 people for 27 years found no link between phone usage and tumour rates6. The physics were straightforward: 5G signals are non-ionizing radiation, lacking the energy to break chemical bonds or damage DNA, which is the mechanism required for radiation to cause cancer6.

The global pattern of the wildfire showed the initial UK-centered events in April 2020 being echoed months later in different countries around the world, a ripple effect that extended through at least November 2021 according to long-term tracking of related social media content3.