Emotional regulation is a key factor in coping with cancer diagnosis and treatment. Given the emotional impact of a cancer diagnosis—including fear of death, uncertainty about the future, and adverse effects of treatments—the ability to manage and adapt to emotions, especially intense and negative ones, becomes critical to patients’ psychological and physical well-being. More adaptive emotional regulation strategies facilitate this process, helping patients cope with emotions and make positive behavioral changes. Research suggests that better emotional regulation skills not only improve quality of life, but also help patients find meaning and purpose, even in the face of adversities associated with cancer. Thus, emotional regulation is essential for healthy and resilient coping with the disease, contributing to emotional stability and a more effective response to the physical and psychological demands of cancer.