Neuroticism, a personality trait characterized by negative emotional responses to stress, frustration, or loss, is a significant public health concern. It is strongly correlated with various mental and physical disorders, comorbidity, and health service use. Neuroticism predicts the quality and longevity of life, making it a critical area for research. It is a robust predictor of mental and physical health outcomes, independent of demographic factors. Neuroticism is linked to mental disorders such as depression, anxiety, schizophrenia, and substance use disorders, as well as physical health issues like cardiovascular disease and immune system dysfunction. It also contributes to comorbidity among mental disorders, leading to more severe and costly health outcomes. Neuroticism is associated with increased mortality and physical health problems, even when controlling for depression. It is also inversely related to positive outcomes like marital satisfaction and quality of life. Genetic studies suggest neuroticism has a heritable component, with genes like 5-HTTLPR influencing its expression. Environmental factors, including childhood experiences, also play a role. Causal mechanisms linking neuroticism to adverse outcomes include shared genetic influences, increased stress and reduced social support, and heightened emotional reactivity to stress. Understanding these mechanisms is crucial for developing prevention strategies. Neuroticism's predictive utility for health outcomes highlights its importance in public health, emphasizing the need for research into its causes and effects to improve prevention and treatment.Neuroticism, a personality trait characterized by negative emotional responses to stress, frustration, or loss, is a significant public health concern. It is strongly correlated with various mental and physical disorders, comorbidity, and health service use. Neuroticism predicts the quality and longevity of life, making it a critical area for research. It is a robust predictor of mental and physical health outcomes, independent of demographic factors. Neuroticism is linked to mental disorders such as depression, anxiety, schizophrenia, and substance use disorders, as well as physical health issues like cardiovascular disease and immune system dysfunction. It also contributes to comorbidity among mental disorders, leading to more severe and costly health outcomes. Neuroticism is associated with increased mortality and physical health problems, even when controlling for depression. It is also inversely related to positive outcomes like marital satisfaction and quality of life. Genetic studies suggest neuroticism has a heritable component, with genes like 5-HTTLPR influencing its expression. Environmental factors, including childhood experiences, also play a role. Causal mechanisms linking neuroticism to adverse outcomes include shared genetic influences, increased stress and reduced social support, and heightened emotional reactivity to stress. Understanding these mechanisms is crucial for developing prevention strategies. Neuroticism's predictive utility for health outcomes highlights its importance in public health, emphasizing the need for research into its causes and effects to improve prevention and treatment.