Oncology nurses provide comprehensive care by assessing the physical, emotional, and psychosocial needs of cancer patients. They educate patients about their diagnosis, treatment options, and potential side effects. Nurses also assist in managing side effects and complications, such as nausea, pain, and fatigue, through medication and supportive therapies. Furthermore, they offer emotional and psychological support, helping patients and their families cope with the stress and uncertainty that often accompanies a cancer diagnosis.