The purpose of this study was to explore the effects of hearing, voice disorder, stuttering and dyslexia on the academic performance, the feeling of social rejection, self-confidence of hard science major students in universities in Morocco. 229 students belonging to the University Hassan II Mohammedia –Casablanca representing a biology college and an engineering school participated in the survey. The average age of students is 22 years and suffers no physical or mental disability. Our results indicate that these disorders are related to low self-confidence, developed the feeling of social rejection and this considered major difficulties for success in studies. The majority of students say that they encountered difficulties to continue their studies, which suggests that the disorder leads to a form of academic failure. Keywords: Communication disorder, learning difficulties, academic performance, self- confidence