Cancer is one of the main causes of disability and death all over the world and its frequency is increasing day by day. Considering that various treatments are not effective in the final stages of cancer patients' lives and also considering the increasing importance of palliative care in controlling pain and creating peace and well-being, it is necessary to conduct studies in this field to determine the effect of care to identify palliative effects on different dimensions of life of cancer patients. Therefore, the researchers decided to conduct a review to determine the impact of palliative care on the quality of life of cancer patients. In this study, the keywords Cancer, Palliative, Sedative, Patient, Care, and Quality were searched in the data center of the scientific databases PubMed, Scopus, and Science Direct. The results obtained from various studies showed that providing palliative care for cancer patients in all age groups is necessary to provide client-centered care. In the current study, the topic of early palliative care and that palliative care should be started as soon as possible so that the maximum benefit can reach the patients and the care of the elderly was of great importance. Palliative care will lead to speeding up recovery, reducing the duration of hospitalization, and reducing hospital and treatment costs. Establishing and strengthening supporting institutions, creating a culture to adapt to all kinds of problems, and providing palliative care for cancer patients seems necessary.