Patient education is a key element in the management of asthma. This study aimed to evaluate the popularity and usefulness of YouTube videos on asthma. Two authors screened and evaluated the 200 most popular videos. Data on likes, dislikes, views, comment, source of uploader, days since upload, and usefulness were recorded and included for analyses. The usefulness of the videos was categorized as follows: useful, misleading, or neutral. Misleading videos provided at least one scientifically...