Can tumors grow during radiation therapy?

Whether a tumor grows during radiotherapy depends on the tumor's sensitivity to radiation and the individual's response to treatment, so it cannot be generalized. The specific analysis is as follows:

If the tumor is sensitive to radiotherapy and the patient responds well to treatment, the tumor typically does not grow during radiotherapy and may even shrink. Radiation therapy works by using radiation beams to damage the DNA of tumor cells, thereby inhibiting their ability to proliferate. In sensitive tumors, cell growth is significantly impeded after exposure to radiation, with some cells gradually dying off. As a result, tumor volume may decrease, and the condition generally remains stable or improves during treatment.

However, if the tumor is not sensitive to radiotherapy or the individual has a poor response to treatment, the tumor may still grow during radiotherapy. These tumor cells are more resistant to radiation, making it difficult for the radiation to effectively suppress their proliferation. In some cases, tumors may continue growing during treatment, leading to an increase in size and possibly resulting in disease progression or new symptoms.

Regular imaging examinations are necessary during radiotherapy to monitor changes in tumor size and overall health. Keep the skin clean and dry, avoid friction on the irradiated area, and prevent worsening of skin damage. Pay attention to nutritional intake by consuming high-protein and high-vitamin foods to strengthen the body's resistance. If significant discomfort such as pain, fatigue, or decreased appetite occurs, promptly communicate with the doctor to adjust the treatment or care plan. Do not discontinue treatment on your own.