Ontario Online Sports Betting Linked to 99% Surge in Gambling Disorder ER Visits

New research from the University of Toronto has documented a striking correlation between the legalization of online sports betting in Ontario and a substantial increase in severe gambling-related health emergencies. The study, published in the American Journal of Preventive Medicine and covering data from January 2012 through June 2025, tracked emergency room visits for gambling disorders and found a steady quarterly increase of approximately 7% following the April 2022 launch of Ontario's regulated private online gambling market. By mid-2025, ER visits had reached 99% above expected levels had online gambling not been legalized.

The findings reveal a pronounced demographic pattern. The spike affected males almost exclusively, with no corresponding increase among females. The largest proportional increases occurred in younger age groups: males ages 10-29 experienced a 154% rise in ER visits by the second quarter of 2025, while males ages 30-44 saw a 116% increase. Older age groups experienced more modest increases. Critically, the data shows these were not minor cases. Nearly one-third of all gambling-related ER visits resulted in hospitalization, indicating severe presentations requiring inpatient care.

The study also documented the clinical complexity of these cases. More than 70% of ER visits involved a comorbid mental health condition or heavy substance use, with gambling disorder listed as either the primary or a contributing diagnosis. Clinicians noted that gambling behaviors were exacerbating conditions including major depression, suicidal ideation, and substance use disorders. A companion study published in the Canadian Medical Association Journal found parallel trends in contacts to ConnexOntario, the province's 24-hour mental health and addictions helpline. Gambling-related helpline contacts doubled overall after April 2022, with the largest increases among males ages 15-44, including a striking 317% rise among those ages 15-24.

Researchers emphasized that ER data represents only the most extreme cases within the broader harm landscape. Study co-author Ryan Forrest noted that emergency presentations do not capture milder but still consequential harms such as financial problems, relationship strain, and deteriorating mental health affecting the general population. This suggests the true scope of gambling-related harm may substantially exceed what hospital data alone reveals.

The timing of Ontario's legalization offers a clear natural experiment. The April 2022 online market launch followed federal legislation in August 2021 that permitted provinces to legalize single-event sports betting. This regulatory shift triggered rapid expansion of digital gambling platforms, aggressive marketing campaigns, and continuous promotional offers, including so-called risk-free betting products that critics argue misrepresent their actual risk profile.

The Ontario findings carry significant implications for U.S. jurisdictions. Since the 2018 Supreme Court decision striking down the federal sports betting ban, more than 30 states have legalized sports wagering, many also permitting online casino gambling. These markets create a continuous 24/7 pipeline of high-speed wagering accessible via smartphone, combining factors public health experts have identified as uniquely problematic: constant access, rapid betting cycles, targeted demographic marketing, and anonymous wagering.

Researchers argue the data constitutes a clear warning signal warranting stronger regulatory guardrails. Recommendations include advertising restrictions, mandatory spending limits, and improved integration between gambling platforms and mental health services. As Ontario's experience demonstrates, the harms from legalized online gambling can emerge quickly and with measurable clinical severity, particularly in younger male populations.