The signs of the day before death in cancer patients are in two main directions. In the first direction, the vital signs drop dramatically and a state of near death occurs. In the second direction, the residual light is rekindled and there is a transient improvement in vital signs. Specifically, before the death of a cancer patient, there will be no pupil reflexes, eyes that cannot be closed, as well as bleeding in the digestive tract, a purring phlegm sound in the throat, drooping nasolabial folds, and other phenomena of imminent end of vital signs, which cannot be saved by applying medications, especially intravenous fluids, which cannot change the patient’s state, but will cause edema of the skin. The patient may be usually very weak, and the day before death will go down to the ground, walk or eat food, and the state suddenly improves, which is the last bit of yang energy emitted from the body, which will not last long, and will soon fall into coma and near death.