This article presents moderating influences, one of the sub-core categories from the theory of accommodating interruptions. This theory emerged in the context of young people who have asthma, explaining how they develop behaviours in their everyday lives (Hughes 2014; Hughes et al., 2017). The aim of this research was to develop a theory on the behaviours of young people who have asthma, in relation to the impact of asthma on the lives and the issues affecting them. This research was undertaken using a classic grounded theory approach. Data were collected through in-depth interviews, participant diaries and clinic consultations with young people aged 11-16 years who had asthma for over one year. Moderating influence accounts for how social influences and social culture affect what young people who have asthma wish to achieve and how they want to be perceived by others. Young people moderate influences by their features or attributes in order to meet their own needs.