Vocal abuse and misuse would lead to plica vocalis polyp. Certain features define the extent of vocal folds polyp effects on voice acoustic parameters. this study aimed to define the results of polyp size on acoustic voice parameters, and compare these parameters in hemorrhagic and non-hemorrhagic polyps. within the present retrospective study, 28 individuals with hemorrhagic or non-hemorrhagic polyps of verity vocal folds were recruited to research acoustic voice parameters of vowel/ æ/ computed by the Praat software. the info were analyzed using the SPSS software, version 17.0. per the sort and size of polyps, mean acoustic differences and correlations were analyzed by the statistical t test and Pearson correlation test, respectively; with significance level below 0.05. The results indicated that jitter and also the harmonics-to-noise ratio had a big positive and indirect correlation with the polyp size (P=0.01), respectively. additionally, both mentioned parameters were significantly different between the 2 sorts of the investigated polyps. Vocal polyps are thought to result from vocal misuse or overuse, like hard glottal attacks.1 These small growths vary in size, shape, and color and should appear as pedunculated or sessile.2 In severe conditions, polyps turn hemorrhagic and emerge as blood blisters on vocal cords.3 this happens when collision forces, generated during the oscillatory cycle of phonation, cause microtrauma within the basement membrane of epithelium and therefore the superficial layer of the lamina propria. Consequently, oscillation of vocal folds ends up in neovascularization and hemorrhagic events within the damaged tissue.4 betting on the dimensions, position, and kind of polyps, abnormal voice qualities including hoarseness, harshness, and breathiness would differ.3 the dimensions of polyps varies from small to large masses,1 and a criterion to differentiate polyps from nodules is defined as mass bigger than 0.3 mm whereby bigger masses can be classified as polyps.