The 2026 FIFA World Cup — now underway across 16 host cities in the United States, Canada, and Mexico — is the largest sporting event in the tournament's history, featuring 48 nations and more than 5 million fans. Eleven of those 16 cities are in the United States. The matches run for 39 days, from June 11 through mid-July. And in city after city, in fan zones and stadium precincts and sports bars, that duration is creating an unprecedented sustained concentration of the conditions that public health experts know produce preventable emergency room visits.
Dr. Katelyn Jetelina, an epidemiologist and former senior adviser to the U.S. Centers for Disease Control and Prevention, wrote in her widely read public health newsletter Your Local Epidemiologist that heat-related illness is "probably the most reliable risk" at the World Cup beyond infectious diseases. Her phrasing was precise: "Crowds plus sun plus summer temperatures plus physical exertion plus alcohol is a combination that sends people to emergency rooms every year."
That combination is not hypothetical at the 2026 World Cup. It is happening simultaneously in Houston (where daily heat index values regularly exceed 100°F in June and July), Dallas (triple-digit heat is common), Miami (intense summer humidity), Atlanta, Kansas City, and the San Francisco Bay Area. More than one-third of all 104 scheduled matches are being played under conditions the NPR and PAHO analyses have described as dangerously hot. And beer, wine, and spirits are available throughout the stadium and fan zone premises for the duration of every match day.
What the Research Shows About Heat, Alcohol, and Emergency Rooms
The combination Jetelina described is well-characterized in epidemiological research. Alcohol impairs thermoregulation in multiple ways simultaneously: it dilates peripheral blood vessels (accelerating fluid loss through sweating), suppresses antidiuretic hormone (increasing urination and dehydration), reduces the perception of heat stress (making people less likely to seek shade or cooling), and impairs judgment about personal safety including traffic safety.
In outdoor mass-gathering settings during heat, dehydration progresses faster than people typically recognize. Alcohol causes people to underestimate how much they have drunk and how impaired they are. PAHO's June 8, 2026 guidance explicitly warned that alcohol use "can worsen dehydration and affect judgment in crowded or high-temperature settings." FIFA has implemented mandatory cooling breaks during the hottest matches and has shifted several kickoff times to evening hours, meaningful mitigations that do not address fan zones, pre-match gatherings, or the hours after the match when crowds remain active in city centers.
The drunk driving dimension is directly quantifiable. Research on major sporting events consistently shows increases in traffic fatalities and DUI arrests in host cities on game days. Studies examining NFL game days, NBA championships, and prior World Cup matches have found statistically significant spikes in alcohol-related traffic crashes on game day evenings in host cities, particularly on weekend evenings and when local teams are competing. The 2026 World Cup's 39-day span, with matches spread across multiple days each week, creates a sustained rather than concentrated risk period.
| World Cup Alcohol + Heat Risk Factors | Scale and Scope |
| Total duration of World Cup in U.S. | 39 days (June 11 – mid-July) |
| U.S. host cities | 11 |
| Estimated total fans in U.S. cities | More than 5 million |
| Matches under dangerous heat conditions | More than 1/3 of 104 scheduled matches |
| Peak heat index in Houston, Miami | Regularly exceeds 100°F |
| Known effect of alcohol on thermoregulation | Accelerates dehydration; impairs heat perception |
| PAHO warning | Alcohol worsens dehydration and impairs judgment |
| Epidemiological risk formula | Crowds + sun + heat + exertion + alcohol = ER visits |
What Health Officials and Host Cities Are Doing
NPR reported that Dr. Jetelina is serving a central role in the Health Security Operations Center — an independent monitoring operation led by Georgetown University's Dr. Rebecca Katz — that is tracking disease, injury, and public health data across World Cup host cities in real time. The center is conducting surveys of approximately 2,500 people attending World Cup matches, as well as tracking data from people within a 30-mile radius of each stadium, in order to detect early signals of health events across the full range of risks.
The St. Louis Department of Health issued guidance noting that "watch events will take place from June 16 to July 11 and an influx of visitors is expected that may seek medical care for a variety of reasons" — language reflecting the operational reality that host city hospitals and emergency services are preparing for sustained elevated demand, not a single-event surge.
King County, Washington's health department issued a formal health advisory to healthcare facilities and laboratories providing specific guidance on managing World Cup-associated patient presentations, a reflection of the scale of preparation underway in host cities.
For World Cup fans, the public health guidance is consistent across PAHO, CDC, and local health departments: drink water before, during, and after matches; alternate alcoholic drinks with non-alcoholic beverages; never leave alcohol-affected individuals alone in hot outdoor environments; arrange transportation in advance rather than driving after consuming alcohol; and know the location of the nearest cooling center or medical station in the venue or fan zone.
The 2018 FIFA World Cup in Moscow produced documented data on heat-related illness, alcohol-related presentations, and crowd-related injuries, and public health researchers have noted the 2026 edition's summer schedule in the United States represents a substantially higher heat risk than any prior World Cup. Preventing heat illness and alcohol-related emergencies starts with individual behavior, but it also depends on the kind of transparent, science-backed public health communication that Jetelina and the Health Security Operations Center are providing.
Frequently Asked Questions
Who is Dr. Katelyn Jetelina, and why is she warning about the World Cup?
Dr. Katelyn Jetelina is an epidemiologist and former senior adviser to the U.S. CDC and the author of the public health newsletter Your Local Epidemiologist. She is also active in the Health Security Operations Center at Georgetown University, which is monitoring public health data across World Cup host cities in real time. She specifically identified "crowds plus sun plus summer temperatures plus physical exertion plus alcohol" as the formula that reliably produces emergency room visits.
What is the biggest non-infectious health risk at the 2026 World Cup?
Dr. Jetelina stated heat-related illness is "probably the most reliable risk" beyond infectious diseases. More than one-third of scheduled matches are being played under conditions described as dangerously hot, with several U.S. host cities — Houston, Miami, Dallas — regularly reaching heat indices above 100°F in June and July.
How does alcohol make heat-related illness worse?
Alcohol accelerates dehydration by increasing urination and sweating, dilates blood vessels in ways that cause faster fluid loss, suppresses the body's perception of heat stress, and impairs judgment about seeking shade and cooling. PAHO's June 8 guidance specifically warned that alcohol worsens dehydration and impairs judgment in high-temperature crowded settings.
Is drunk driving a documented risk around major sporting events?
Yes. Research on NFL game days, NBA championships, and prior major sporting events consistently shows statistically significant increases in alcohol-related traffic crashes in host cities on event evenings. The World Cup's 39-day span creates a sustained rather than single-event risk window in 11 U.S. cities.
What are the safest practices for World Cup fans attending events in hot weather?
Drink water before, during, and after events; alternate alcoholic drinks with water or non-alcoholic beverages; never drive after drinking; arrange ride-share or public transit in advance; stay in shaded or air-conditioned areas during peak heat hours; know where the nearest medical station or cooling area is in the venue; and monitor companions, particularly older adults and those with underlying health conditions, for signs of heat exhaustion.
