“Coronary prone behaviour pattern” refers to a way of coping with environmental stressors, otherwise known as type A behaviour patterns. Stress, unlimited working hours, and the shift system are conducive to an “unhealthy life style”, conducted by nurses. The aim of the study was to assess the “coronary prone behaviour pattern”, taking into account health behaviour and work performed by Polish nurses. Method: This was a descriptive study conducted from June 2017 to May 2018 among nurses (N = 1080) working primary care or in training facilities in Silesia, Poland. Data were acquired through a series of questionnaires and are presented as descriptive statistics. Results: The “coronary prone behaviour pattern” (type A behaviour) was manifested by 333 (30.8%) nurses, type B by 272 (25.2%). The “coronary prone behaviour pattern” respondents showed a risk of developing a problem with alcohol (p = 0.003) less frequently compared with other respondents. In addition, nurses with the abovementioned behaviour pattern ate better (M = 16.66; SD = 6.11) compared with those with the type B behaviour pattern (M = 15.49; SD = 6.52). In terms of mental and physical wellbeing, people with type A behavioural patterns had significantly (p < 0.001) better mental and physical wellbeing and, on average, better results in coping with stress compared with other behavioural patterns of nurses. Conclusion: The occurrence of the “coronary prone behaviour pattern” was associated with the health-promoting behaviours of nurses being the subject of the analysis, i.e., better mental and physical wellbeing, better ability to cope with stress, and a lower risk of problems with alcohol and proper nutrition.