Regardless of the social or economic status of a student, it is a fact that math is always present. This discipline is considered as a competitive tool for achieving a more productive life. However, the gap in academic achievement is big. Consequently, in the last decades the research on education has set attention on this point. Therefore, this research aims to prove that there is anxiety toward math on high school students at a private institution Rioverde in San Luis Potosí, México and find if there is a difference in regards to gender. We used Auzmendi sub-scale questionnaire. The results show that there is anxiety toward math on high school students, and that women show more anxiety toward math than men do. Thus, we conclude, for the case under study, that anxiety toward math is a learning issue for high school students, more often for women than for men.