Face mask use during the COVID-19 pandemic was associated with breathing difficulties in adolescent patients with asthma.

Aim: Face masks have been used to prevent severe acute respiratory syndrome coronavirus-2 transmission. We investigated the impact of face mask use on paediatric patients with asthma.

Methods: Between February 2021 and January 2022, we surveyed adolescents aged 10-17 attending the paediatric outpatient clinic at the Lillebaelt Hospital, Kolding, Denmark with asthma, other breathing problems or no breathing problems.