Teaching is considered among the most demanding tasks for voice, this study investigated dysphonia in a sample of Egyptian teachers & its relation to Allergy and gastric reflux when other risk factors are almost excluded, and determined the prevalence of dysphonia in the sample under study. The study was carried out by applying a questionnaire to 250 primary school teachers in Fayed city. The questionnaire included 3 main groups of questions in addition to questions about personal and teaching data. The first group was the questions that indicate presence or absence of dysphonia, the second group contain questions that indicate presence or absence of allergy, and the third group was the questions that indicate presence or absence of gastric reflux (the reflux symptom index). The subjects who reported that they suffer from dysphonia were transmitted to the second step of the study, which is acoustic analysis for their voices and laryngoscopic examination for their larynges. The present study revealed that the prevalence of dysphonia in the study sample is 23.2% based on the subjects self impression and was emphasised by the acoustic analysis. In addition this study showed a significant correlation between dysphonia and allergy and between dysphonia and reflux.