Radiation is heat-toxicity. After the thoracic cancer lesions have been exposed in radiation

heattoxicity damages the lungs directly

resulting in heat-toxicity accumulating in the lung

which then causes radiationinduced pulmonary injury. Treatment should follow the principle of "fire stagnation requiring dissipation"; dissipating is a therapeutic method under the principle. Therefore

Chinese medicine doctors using dissipating method to clear heat

open up the closure

disperse Qi movement

expel evil toxicity from deep to surface and dissipate outward.Modified Shengjiang Powder（ 新加升降散） is the main prescription to treat radiation-induced pulmonary injury.