Introduction: Subjects using their voice as the main professional instrument often
develop vocal disorders. Teachers present a high prevalence of vocal problems in
comparison to other professional categories depending on their voice as professional
tool; voice changes could be assigned to the interaction between occupational (vocal
loading), behavioral and lifestyle factors. Voice disorders due to professional overuse
are usually chronic and can lead to an increase in sick absenteeism. Aim of work:
To determine the prevalence of abnormal laryngeal findings among public-school
teachers in Menoufia Governorate, Egypt using strobovideolaryngoscopy. Materials
and methods: A case-control nested into a cross-sectional study was held from March
1st to May 1st, 2019. The sample is composed of four hundred and fifty-seven (457)
teachers of public schools in Menoufia Governorate, Egypt. Results: The prevalence of
vocal lesions among the studied group was 22.1% with (17.79-26.41) 95% confidence
interval. On stroboscopic evaluation, vocal nodules were the most common structural
lesion affecting the larynx; it was present in 42 (9.1%) of teachers. Other structural
abnormalities included the presence of swollen arytenoids, vocal cords paresis,
vocal polyps, vocal cord cyst, and epiglottic mass in a percentage of (5.9, 3.7, 1.7,
1.1, 0.4) respectively. There was higher prevalence of vocal cord lesions among
older teachers with increase duration of employment/years, number of classes /days,
smokers and teachers of primary school; although it didn't show statistically significant
difference. A significant relationship was reported between laryngoscopic findings and  laryngopharyngeal reflux (15.1% vs 28.7% with 0.002 p-value) and water intake/day (t = 2.41, df = 2, p =.047). Conclusion: Results of the current work highlighted the need
for large-scale regular educational programs to minimize vocal cord lesions among
teachers.