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To assist in prolonging life and curing diseases, one avoids unjust death.
When a physician encounters a patient, they should first assess whether the person is near death. If a prescription and medication are administered rashly, even if the medicine is harmless, upon the patient's death, blame will inevitably fall on the physician.
It would be difficult to defend oneself despite having a hundred mouths. Therefore, to master medicine, one must first master "Xiang" (observation/inspection). What is "Xiang"? It refers to inspection (Wang Zhen, 望诊), specifically visual examination. When Mr. Hua encountered a patient, he could first determine the person's lifespan. This was not derived from immortal transmission but resulted from extensive clinical experience. Once, a patient sought treatment from Mr. Hua. Mr. Hua said, "Your disease root is deep; it requires dissecting the viscera to cure. However, your lifespan does not exceed ten years, and the disease cannot be completely eradicated." Unable to bear the suffering, the patient insisted on removal of the ailment. Mr. Hua then performed surgery, and the patient recovered immediately. Ten years later, the patient indeed passed away. (Commentary by Sun Simiao)

If there is stagnation in the middle jiao (middle burner), vomiting provides relief. There are medical methods that should not be explicitly stated but yield very rapid effects.
Zhang Zhongjing treated Shanghan (Cold Damage) by prioritizing emesis (inducing vomiting). Mr. Hua, having studied medical classics, also addressed this. Once, while walking on the road, Mr. Hua saw someone with throat obstruction.
He told him, "Earlier by the roadside, there was a pancake seller; the Pingqi (a type of sour vegetable/herb) is very sour. You can take two sheng [approx. 0.4 liters] and drink it; the illness will naturally go away." The person followed Mr. Hua's advice and immediately vomited up a snake. He then hung the snake on his carriage and waited for Mr. Hua. At that time, Mr. Hua's young son was playing inside the gate. Seeing the scene, the boy said to himself, "There is something hanging beside the guest carriage; it must be because he met my father." When the guest entered and looked back, seeing dozens of snakes hanging on the north wall, he realized Mr. Hua's miraculous nature.
Note: Mr. Hua's treatment of this condition was exquisite and profound. Knowing there was a snake in the abdomen, he did not explicitly state it, fearing the patient's terror. Fear causes the snake to shrink,
preventing it from being expelled via vomiting. Some physicians, worrying about future complications, explain details too thoroughly to patients, causing them to refuse medication and worsening the illness. Observing Mr. Hua's treatment of abdominal snakes illustrates this point.

Raw fishy substances transform into parasites, though they originate from hidden sources.
Note: Mixing fishy offal with sugar and flour, and burying it in the soil overnight produces worms resembling earthworms. Poultry keepers often use this to feed chickens, as they grow faster and more abundantly than other insects. This reflects the Heavenly Dao's endless generation; seeking life through living things results in spontaneous generation without deliberate creation. Chen Deng, the Grand Administrator of Guangling, suddenly suffered from chest distress and fullness, red face, and loss of appetite. Mr. Hua took his pulse and said, "Sir, you have parasites in your stomach, which will form Neiju (Internal Carbuncle/Abscess), caused by raw fishy foods." He immediately prepared a decoction (Tang), two sheng in volume, for him to take. After taking it twice, within a short while, he vomited violently. Small worms with red heads that could move were found, half of which were still part of the raw fish sashimi. His suffering was immediately relieved. Mr. Hua said, "This disease will recur in three years,
because residual eggs remain in the body; these eggs are difficult to completely eradicate. With a good physician, it can be saved." When the time came for the disease to flare up, Hua Tuo happened to be away, and Chen Deng subsequently died. (Commentary by Sun Simiao)