Adult and teenage second language learners are very interested in foreign language classroom anxiety (FLCA). In language classes all across the world, foreign language anxiety (FLA) is a significant issue. It is especially directly tied to expressive abilities in a second language. There are many subjective and objective factors that affect foreign language performance. Anxiety in FLA is one of the emotional elements, and it is the key factor among the factors impacting students' second language learning. Based on previous research and scholarly papers, this study conducts a literature review to organise the pertinent material on anxiety in the foreign language classroom (FLC), including its definition, causes, and effects on students' learning and performance. Anxiety in the classroom when learning a foreign language typically results from oral activities and has a detrimental impact on language abilities including listening, reading, and writing. Moderate anxiety has been shown to occasionally boost positive learning motivation, but excessive worry is still harmful to learning. Therefore, teachers need to adopt appropriate strategies in dealing with FLCA. The key to lowering anxiety in the FLA is creating a friendly and encouraging classroom atmosphere and developing positive teacher-student connections. Overall, this paper endeavors to provide educators with insights into anxiety in the FLC and how to cope with this affective factor in their educational practices to promote better student learning and acquisition of foreign language skills. This topic has important social and educational implications on a global scale and deserves further research and study.