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It is said to be caused by thorns pricked by a wild fox's urine. If one encounters it, it often injures the fingers or toes, causing swelling, pain, and heat. If one remains seated indoors for a long time and contracts this toxin, it may not necessarily be from a fox-urine thorn; rather, it is likely due to malignant toxic vapors. Therefore, medical texts also refer to it as "malignant thorn poison."

This is actually a type of hairy caterpillar (Oyster Worm) found on trees. It is named so because its bristles can sting people. The toxicity is relatively mild and does not usually lead to deep-seated death, but the pain is severe. The stung area develops urticarial wheals.

The Qu Su insect (a type of venomous insect) is said to affect a person's shadow through its urine. Wherever the urine touches, it causes intense pain like thorn pricks, similar to an Oyster Worm sting, followed by the appearance of small nodules clustered like Chinese bayberry fruits. These nodules become red all over, with a millet-sized white pus head in the center. It also causes skin and muscle spasms, accompanied by aversion to cold and high fever. In severe cases, they appear continuously, mostly affecting the waist, flanks, and chest. If they encircle the waist completely, the condition is serious.

Ancient wells, tombs, and deep pits often contain toxic gases and should not be entered casually. This is most prevalent during May and June due to the accumulation of stagnant qi. If entry is necessary, first drop chicken or duck feathers to test: if the feathers spin and do not sink, it indicates toxicity, and one must not enter.

Wounds inflicted by metal blades often exhibit various changes. If pressing the wound edges reveals dryness and tension, lack of muscle regeneration, discharge of greenish-yellow fluid, cold and clear sensation at the edges, wasting and putrefaction of flesh, initial bright red blood followed by dark black blood resembling cooked rot, continuous bleeding with accompanying white fluid, these signs indicate a poor prognosis. Injuries to collaterals, inner thighs, groin, Tiāncōng acupoint, eyebrow corners, transverse severing of the gastrocnemius muscle, above the breasts, Jiūwěi acupoint, pubic region, or lower abdomen, where urine leaks from the wound, breath rises like Ben Tun disease (fleeing pig), or brain matter protrudes, are generally fatal with few recoveries.

In diagnosing metal wounds, excessive bleeding with a deficient and fine pulse suggests survival; a rapid, full, and large pulse suggests death. A small pulse suggests survival; a floating and large pulse suggests death. For injuries in Yang regions, losing four or five dou of blood with a slightly slow and delayed pulse suggests survival; a rapid and urgent pulse suggests death.

For metal wounds with unceasing bleeding, a large pulse indicates death within twenty-one days. If bleeding cannot be stopped, with initial bright red blood turning dark, or yellow/white discharge, putrefied and foul-smelling muscles, and cold, stiff, and tense tissues, the wound is difficult to heal and will likely result in death.