Background: Communication errors reflect excess anxiety levels of both patients and students. Anxiety symptoms of psychiatric patients are commonly intertwined with communication errors of nursing students. The aim of this study was todetermine the relationship between common errors of communication among psychiatric nursing students and anxiety levels of their assigned patients. Research design: Descriptive correlational design was utilized to achieve the aim of this study. Setting: The study has been conducted at the Psychiatric Mental Health Hospital in Benha City which is affiliated to the General Secretariat. Sample: A convenient sample of all the academic 4^th year students who were undergoing psychiatric nursing experience at Faculty of Nursing; Benha University, 180 students and their assigned patients 180 patient were recruited. Tools of data collection: Two tools were used. I: Structured interviewing sheet consisting of two parts; to assess personal characteristics and common errors of communication among psychiatric nursing students during their clinical experience. II: Anxiety scale to assess level of anxiety of psychiatric patients. Results: 84.4% of students have communication errors ranged from mild to high and 85% of the studied patients have anxiety ranged from extreme to moderate level. There is statistically significant positive correlation between total mean score of  communication errors of the students and total mean score of patients anxiety at p-value = (0.04). Conclusion: The comorbid anxiety symptoms are highly prevalent among psychiatric patients due to communication errors of nursing students. When communication errors increases levels of anxiety increases. Recommendations: Educational programs of communication skills should be conducted for all nursing students to minimize their communication errors and minimize their assigned patient's anxiety.