The growing popularity of slap fighting, a sport where opponents take turns slapping each other, has raised significant health concerns among medical experts. Researchers at the University of Pittsburgh conducted the first formal study on the sport, published in JAMA Surgery, revealing alarming rates of concussion and brain injury among participants, with 44 out of 56 fighters showing signs of concussion. The study analyzed 333 slaps and found that nearly 80% of matches displayed visible signs of concussion, including loss of coordination and consciousness. Despite warnings from the medical community, slap fighting is set to expand internationally, with a major event planned in Liverpool next month. Critics argue that the sport lacks safety measures compared to more established combat sports, leading to serious risks for participants. As slap fighting continues to gain traction, experts urge for greater awareness and regulation to protect the health of its athletes.