The Mathematics of World Suicide Prevention Day

10 September is World Suicide Prevention Day. Mathematics is used to analyse risk factors (statistical models), predict crisis periods (time series analysis of calls to helplines), and evaluate interventions (randomised controlled trials, meta‑analysis). The complex interplay of mental health, social support, and economic factors is modelled using network theory (contagion of suicidal behaviour) and machine learning (identifying at‑risk individuals from social media). Mathematics does not replace compassion, but it helps allocate resources and understand trends.