Using your mobile phone in the toilet is harmful to your health—and the cause isn't "germs"

The preconceived notion of "toilet = unclean = germs are dangerous" often takes precedence, but the latest research highlights a different risk. Bringing a smartphone into the bathroom extends the duration of your stay, increasing the pressure on the veins around the anus and raising the risk of hemorrhoids by 46%. This finding comes from a cross-sectional study by the Beth Israel Deaconess Medical Center in the United States, which showed a significant association even after adjusting for age, gender, BMI, fiber intake, and straining. Smartphone users are more likely than non-users to spend more than **5 minutes per toilet visit**, and prolonged sitting itself is a known risk for hemorrhoids. Additionally, the posture of leaning forward to look at the screen exacerbates musculoskeletal strain in the neck, shoulders, and back (commonly known as "tech neck") and disrupts the timing of the defecation reflex. In other words, toilet × smartphone = ① prolonged stay (venous congestion) ② poor posture (musculoskeletal pain) ③ distraction (missed bowel movement opportunities)**, resulting in compounded damage. The solution is simple: return the toilet to its primary purpose as a "place to relieve oneself": do not bring your smartphone, aim to stay for 5 to 10 minutes, adjust your sitting position, use a footstool, and ensure a diet rich in fiber and hydration along with regular exercise. More than disinfectant wipes for germ control, managing time and revising habits is the best "hygiene." This article explains the key points, mechanisms, and immediately applicable rules of the research in the context of Japanese lifestyle.