A patient, diagnosed with cancer, has been receiving radiation treatments to shr

1 -- Direct tumor involvement is the primary cause of the pain experienced by people with cancer. The pain from tumor involvement is believed to be mechanical, resulting from stretching of tissues and compression. Radiation treatments that are successfully shrinking a tumor would reduce the amount of tissue compression by the tumor and reduce the pain. The tumor is not secreting pain-control chemicals initiated by the radiation. The patient is not getting used to having pain. The patient is also not continuing to have pain but believes the radiation treatments are reducing the pain.