Noise sensitivity is a concept used to explain the different effects of noise on people's health. Numerous definitions of noise sensitivity have been proposed, though none are universally accepted. Hence, a "system model of noise sensitivity" was developed, suggesting that noise sensitivity may contain a set of factors. Based on this, we conducted semi-structured interviews to investigate noise sensitivity and its factors and used qualitative research methods to analyse the data. More factors of noise sensitivity were discovered, and a revised system model was developed. This expanded model provides a more complete definition of noise sensitivity. We hope the improved understanding could lead to identifying ways of coping with noise issues. In the future, more diverse and individualized approaches could be developed to address the many different aspects of noise sensitivity.