Being in a relationship that is full of anger and hostility can increase your chances of having a heart attack or experiencing chest pain by 34%, compared to those in a healthier relationship. As part of the research, civil servants completed questionnaires about problems in their close relationships. They were then followed up 12 years later, where the health risks of problem relationships were identified. When risk factors such as alcohol, obesity and smoking were accounted for, the risk was still 23% higher. The research was led by DeVosti, from University College London.