Chemoradiation, also known as chemoradiotherapy, is a form of cancer treatment that combines chemotherapy and radiation therapy to improve the effectiveness of treatment. This approach is commonly used in the treatment of various types of cancers, including lung, head and neck, and cervical cancers. Chemotherapy involves the use of drugs to kill cancer cells or stop them from growing, while radiation therapy uses high-energy radiation to destroy cancer cells. When used together, chemoradiation can help to target cancer cells from multiple angles and increase the likelihood of successful treatment. This treatment approach may be used before surgery to shrink tumors, after surgery to kill any remaining cancer cells, or as the primary treatment for unresectable cancers. Chemoradiation can also help to reduce the risk of cancer recurrence and improve overall survival rates. Overall, chemoradiation is a powerful and effective treatment option for many types of cancer, and ongoing research is focused on refining the techniques and improving outcomes for patients undergoing this combined therapy.