Marital satisfaction is vital for personal well-being and professional effectiveness, yet relational red flags such as nagging, physical harassment, and verbal bullying undermine marital harmony. This study examined their influence among secondary school teachers in Akwa Ibom North-West Senatorial District, Nigeria, using a descriptive survey of 520 married teachers selected from a population of 5,202, with data collected via the validated “Red Flags and Marital Satisfaction of Teachers Questionnaire (Cronbach’s alpha = 0.792–0.961) and analyzed using mean, standard deviation, and independent samples t-tests at 0.05 significance level. Findings revealed that teachers with low marital satisfaction reported higher levels of nagging (2.44), physical harassment (1.92), and verbal bullying (2.18) than those with high satisfaction (1.79, 1.39, 1.48). With significant differences across all variables (nagging: t(507) = 11.548, p = .000; physical harassment: t(507) = 9.146, p = .000; verbal bullying: t(507) = 12.800, p = .000), indicating that these behaviours significantly reduce marital satisfaction by eroding trust, communication, and emotional intimacy, and highlighting the need for targeted counselling interventions and support systems to improve marital well-being among teachers. It was concluded that persistent nagging create tension and reduce open communication between spouses. Physical harassment and verbal bullying damages trust, emotional safety and mutual respect, often leading to fear, resentment and psychological distress. It was recommended among many others that Teachers who are in abusive relationship whether at home or at work should seek support from counselling psychologists, social workers or legal aid so as to gain awareness on how to do away with physical harassment and other forms of domestic abuse.