Background: The defense mechanisms are responsible to protect the ((Ego)) against hardships, anxieties, and environmental and internal deficiencies. These mechanisms may be normal or abnormal while being influenced by the different constitutes of personality. Materials and Methods: This research was done in order to study the defense mechanisms of both patients suffering from breast cancer and the nonclinical group. In this study 246 patients with breast cancer and 204 students were selected as samples. The tool of data-gathering in this study was DSQ. Results: The finding showed that the mean of immature and neurotic defense mechanisms in the group suffering from breast cancer was significantly more than of nonclinical group. On the other hand, the mean of mature defense mechanisms in the nonclinical group was more than that of the group suffering from breast cancer. Conclusion: This research, whether in terms of scope or issue _was the fewest studies that has examined some of the psychological factors in patients with Breast cancer. And concordant with previous theories based on interconnected components of psychological and physical ills gave this result that the Breast cancer sufferers use mechanisms that the psychodynamic theorists believe they function as a glimpse towards physical and mental abnormalities.

Keywords: defense mechanisms, breast cancer, Anxiety.

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