Foreign language anxiety (FLA) is a well-established phenomenon that significantly impacts language learners across various educational contexts. This paper offers a comprehensive exploration of FLA, examining its causes, manifestations, and consequences in the classroom. The study highlights the psychological and emotional dimensions of FLA, identifying the key components: communication apprehension, test anxiety, and fear of negative evaluation. It also discusses the influence of cultural and interpersonal differences and personality traits on the intensity of anxiety experienced by learners. The role of teachers in mitigating FLA through supportive and empathetic classroom environments is emphasized, along with strategies such as task-based learning and peer feedback. Furthermore, the paper critiques the limitations of existing tools, like the Foreign Language Classroom Anxiety Scale (FLCAS), and proposes alternative approaches for assessing FLA. Finally, suggestions for future research are provided, focusing on longitudinal studies, the role of technology, and the refinement of assessment tools to enhance our understanding of FLA and improve language acquisition outcomes. By addressing FLA in a nuanced manner, educators can create a more conducive environment for language learning, fostering both linguistic and emotional growth.