A recent discussion on Reddit has shed light on an unexpected reason why passengers might trigger alarms during airport security screenings. The conversation began when a traveler shared their experience of being flagged twice at the arms-up scanner due to their crotch area. This sparked a lively debate on the “r/tsa” forum, where users speculated about the causes of such alarms. The original post, titled “My crotch got flagged twice, thoughts?” described how the passenger, flying for the first time in 15 years, was subjected to additional screening at two different airports. Despite the inconvenience, the traveler noted that TSA agents were polite and professional during the pat-downs. The incident prompted curiosity about what might have caused the alarms. Several Reddit users suggested that excessive sweating could be a factor, especially during summer months when temperatures rise. One user shared their personal experience, stating that heavy perspiration had previously triggered alarms for them. Another commenter asked if the passenger was sweating, to which they replied affirmatively, attributing it to their fear of flying. A spokesperson for the Transportation Security Administration (TSA) confirmed to Fox News Digital that sweat could indeed influence security checks. They explained that moisture from a person’s body can change the density of clothing, potentially causing Advanced Imaging Technology (AIT) machines to alarm. In such cases, passengers may need to undergo further screening, including a pat-down in the area where the alarm was triggered, to ensure there is no threat. Other factors mentioned by forum participants included clothing choices, such as baggy or layered outfits, and improper positioning during scanning. The discussion highlighted how seemingly minor details can impact airport security procedures and emphasized the importance of understanding these nuances for smoother travel experiences.