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Ascaris lumbricoides (Hui Chong) is one of the nine types of intestinal parasites. Its length may be one chi, or five to six cun, generally triggered by weakness of the Zang-Fu organs. It may also be induced by consuming rich and sweet foods. When active, it causes abdominal pain attacks, with swelling and aggregation that move up and down; the pain has intervals. It may also attack the heart region, accompanied by a tendency to salivate and vomit clear water. If the worm penetrates the heart, death ensues. Regarding the pulse: in cases of abdominal pain, the pulse should be deep, weak, and wiry; if it is instead large, it indicates Ascaris infection. This pain is caused by consuming overly sweet food too early. The child cries loudly due to fear of pain; diagnosis can be confirmed if the area above the philtrum to the nose tip and lips suddenly turns black.

This condition should be treated with Shijunzi Wan (Quince Seed Pill), Binglang San (Betel Nut Powder), or Huachong Wan (Worm-Dissolving Pill). Once the worms are expelled, the patient will recover. Zhang Zhongjing stated: "In cases of Hui Jue (Ascaris Cold Reversal), the patient typically vomits worms. Now, if the patient alternates between quietness and restlessness, this indicates cold in the Five Zang organs, and Wumei Wan (Mume Pill) should be primarily used." For severe cases where worms perforate the intestines, decocting and taking Yiyi Gen (Coix Root) brings relief.

Shijunzi Wan (Quince Seed Pill): Treats pediatric five kinds of Gan syndrome (malnutrition due to parasitic infection), disharmony of the Spleen and Stomach, abdominal distension and fullness, occasional pain, refusal of milk and food, leading gradually to emaciation.
Ingredients: Houpo (Magnolia Bark), Chenpi (Aged Tangerine Peel) (each 1 liang); Shijunzi Rou (Quince Seed Meat) (1 liang, soaked in hot water to remove black skin); Gancao (Licorice Root), Chuanxiong (Sichuan Lovage Rhizome) (each 2.5 qian); add Shaoyao (Peony Root).
Preparation and Administration: Grind the above ingredients into fine powder, mix with refined honey to form pills the size of Euryale Seed (Qianshi Zi). Take one pill per dose, swallowed with rice water on an empty stomach.

Huachong Wan (Worm-Dissolving Pill): Treats pediatric heart pain caused by worm bites, with unpredictable onset and cessation, and loss of appetite for milk and food.
Ingredients: Leshe (Chrysanthemum Seed), Binglang (Areca Nut), Hufen (Lead White), Kulian Gen (Melia Root Bark) (each 0.5 liang); Mingfan (Alum) (3.5 qian, half raw and half calcined).
Preparation and Administration: Grind into fine powder, bind with wheat paste to form pills the size of Mung Bean. For three-year-olds, administer thirty pills, swallowed with warm water mixed with two drops of sesame oil. If taken before meals, small worms dissolve into water, and large worms are naturally excreted. Initial administration is very effective.

Wumei Wan (Mume Pill): Treats Ascaris disturbing the diaphragm, causing recurrent upward movement; vomiting and restlessness after eating, and aversion to the smell of food. Taking this pill should induce vomiting of worms. It also treats chronic dysentery.
Ingredients: Wumei (Mume Fruit) (23 pieces); Ganjiang (Dried Ginger) (2 qian, processed), Huanglian (Coptis Rhizome) (2 liang); Chuanjiao (Sichuan Pepper), Danggui (Angelica Sinensis) (each 0.5 liang); Xixin (Asarum), Fuzi (Processed Aconite Root, peeled and de-navel), Renshen (Ginseng), Guizhi (Cinnamon Twig), Huang [missing character, likely Huangqi] (each 7 qian).
Preparation and Administration: Grind the above ingredients into powder. Soak Wumei meat in wine overnight, remove pits, steam until cooked, pound into a paste, and mix uniformly with the powder to form pills the size of Hemp Seed. Take ten pills after meals, three times daily. Avoid raw and cold foods.