Purpose <p>The aim of this study is to analyse the possible spontaneous regression of severe adenoid hypertrophy in patients who performed nasal surgery.</p> Methods <p>Following the inclusion criteria, 83 adult patients were retrospective selected. These patients were characterized by adenoid hypertrophy from second to fourth grade before performing septoplasty andbilateral or monolateral reduction of hypertrophy of the turbinates and/or endoscopical sinus surgery (ESS).</p> Results <p>Adenoid hypertrophy (grade 2-3-4) can be noted in 6.8% (83/1220) of patients who performed nasal surgery. Regarding the grade of hypertrophy before and after surgery, a clear decrease in adenoid size was obtained after nasal surgery (<i>p</i> &lt; 0.001), without performing adenoidectomy, after at least one year of follow-up.</p> Conclusion <p>Spontaneous regression of severe adenoid hypertrophy was observed in all patients who performed nasal surgery. Avoid adenoidectomy during nasal surgery should be a great advantage for patients, eliminating the possibility of complications such as bleeding and uncontrolled scars.</p>