Introduction: The human voice is a complex phenomenon. The anatomofunctional features, psychological traits, social and professional aspects all influence human vocal quality. Voice disorders, also known as dysphonia, affect 3%-9% of the population.

Obesity is epidemic threat. All systems in the body are affected directly or indirectly to various degrees. Due to the physical–pathological modifications related to obesity that compromise all of the body's systems, evaluation of the vocal behavior of obese patients has become a subject of interest. One of these alterations is the corporal disposition of excessive fat, abnormal fat deposits observed on the uvula, soft palate, lateral and posterior walls of the pharyngeal walls, and posterior region of the tongue, all of which are structures belonging to the vocal tract.

Aim of the study: to cast more light on the effect of obesity on voice in patients of morbid obesity.

Methods: this study consisted of a random sample of 50 morbid obese patients. Each patient was subjected to the following survey study including this data (Patient Interview , history taking, Auditory Perceptual Assessment (APA), general examination (BMI and NC)).

Results: A total of 50 obese women were included, average age 36.8 years, weight (132.6±20.5 kg), BMI (52.3±9.4kg/m2), and neck circumference (40.5±1.9). Gastro esophageal reflux symptoms (53.3%) prevailed.

Conclusions: Obesity lead to an important increase in anthropometric parameters. The voice become hoarser, lower pitch and less stable and patient need to use more effort to overcome the increase in respiratory resistance.

Keywords: obesity, respiration, phonation, BMI, NC.