Objective: Since the outbreak of COVID-19, wearing masks and frequent hand washing have become common phenomena. The purpose of this study was to explore the impact of such lifestyle changes on adenoid hypertrophy in children in Beijing. Methods: Baidu Index platform was used to search with adenoid hypertrophy as the keyword, and the search volume of terms from 2017 to 2021 was recorded weekly. Meanwhile, the visits to adenoid hypertrophy in the otolaryngology department of Children’s Hospital, Capital Institute of Pediatrics in the same period were collected and compared, and analyzed. Results: (1) Baidu index indicated that the following group of adenoid hypertrophy was mainly parents of childbearing age, and female parents paid more attention;  (2) From 2017 to 2019, the online attention and outpatient visits to adenoid hypertrophy increased year by year. After the COVID-19 outbreak, the increasing trend declined and stagnated. Conclusions: After the outbreak of COVID-19, epidemic prevention policies (wearing masks, hand hygiene, reducing movement of people, etc.) have a certain inhibitory effect on adenoid hypertrophy.  Keywords: adenoid hypertrophy, COVID-19, Baidu Index platform, masks, hand hygiene Key points: Adenoid hypertrophy may be associated with recurrent respiratory infections in childhood. After the onset of COVID-19, China enacted many epidemic prevention policies. Wearing masks and hand hygiene may reduce the incidence of respiratory infections. Web data provides insight into the real needs of the population. After the onset of COVID, there was a stagnation in network attention and outpatient visit rates for adenoid hypertrophy.