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When an abscess occurs in the large intestine, it may be due to the patient's habitual consumption of alcohol and roasted/spicy foods, leading to the stagnation and steaming of Damp-Heat, which injures the Lung (the official minister). The Lung Qi fails to disperse and descend properly, causing Damp-Heat to flow downward into the large intestine, where it obstructs Qi and Blood, resulting in the formation of an abscess (The Lung and Large Intestine are exterior-interiorly related; when the Lung is injured, Damp-Heat flows downward into the Large Intestine to form an abscess); or it may result from emotional injury, irregular diet, overexertion, or carrying heavy loads, causing Qi and Blood to become disordered. Dampness arises, Phlegm generates, intestinal obstruction occurs, and transformation and transportation fail, leading to condensation. In the early stage, there is fever with aversion to cold, a rapid and hollow pulse, skin dry and scaly like fish scales, the right leg flexed and unable to extend, abdominal urgency with gradual swelling, severe pain upon pressure, a sensation of heaviness in defecation, and dysuria resembling strangury. If the abscess has not yet suppurated, Da Huang Tang (Rhubarb Decoction) should be used to purge; once the blood stasis is completely expelled, peace will return. If the constitution is weak and the pulse is fine, making purgation inadvisable, Huoxue Sanyu Tang (Blood-Invigorating and Stasis-Dispelling Decoction) should be used to harmonize and promote circulation. If the abscess has formed, accompanied by abdominal pain, distension, anorexia, and painful, difficult urination and defecation, Yiyi Ren Tang (Coix Seed Decoction) should be used to resolve and drain pus. If pus discharges through the stool, it is easy to treat; if it emerges at the side of the umbilicus, a horizontal needle should be used for puncture; if pus emerges from within the umbilicus, it is incurable. There is also a condition where the umbilicus protrudes, becomes swollen and hard, and sores develop around the umbilicus, known as Pan Chang Yong (Intertwined Intestine Abscess), treated similarly to the above.

An abscess in the small intestine presents with swelling and hardness in the lower abdomen, pain upon pressure, the left leg flexed and unable to extend, frequent urination resembling strangury, occasional sweating, aversion to cold, generalized dry and scaly skin, tight abdominal wall, and in severe cases, abdominal distension. This condition may arise from Liver pathogenic accumulation, cold coagulation, and Qi obstruction; or from Qi stagnation and blood congealing during postpartum or menstruation, leading to disharmony of Ying and Wei (Nutritive and Defensive Qi); or from frantic running, carrying heavy loads over long distances, sexual indulgence after drunken meals, or simultaneous intake of raw and cold foods, injuring the intestines and stomach, causing敗血 (decayed blood) and turbid Qi to stagnate and obstruct. For those caused by long-standing Yin-Cold, warm agents should be used to warm and disperse, such as Fuzi Yiyi Ren Baijiang San (Aconite, Coix Seed, and Patrinia Powder) from *Jin Gui Yao Lue*; for those caused by internal heat binding, purgative methods should be used, such as Da Huang Tang (Rhubarb Decoction) from *Jin Gui Yao Lue*; for Qi stagnation and blood congealing, Xuanfu Hua Cong Jiang Tang (Inula Flower, Scallion, and Red Sage Decoction) is appropriate. Additionally, Xue Lizhai stated: A slow and tight pulse indicates no pus has formed; Dan Mudan Pi Tang (Moutan Cortex Decoction) should be used to purge, expecting blood discharge. A surging and rapid pulse indicates pus has formed; Yiyi Ren Tang (Cois Seed Decoction) should be used to expel pus. Lower abdominal pain with difficulty in urination indicates pus stagnation; Mudan Pi San (Moutan Cortex Powder) is the primary treatment. For Qi and Blood deficiency, Bazhen Tang (Eight Treasure Decoction) added with Huangqi (Astragalus Root), Rougui (Cinnamon Bark), Mudanpi (Moutan Cortex), and Bei Wuweizi (Schisandra Fruit) should be used to astringe and tonify. Ancient treatments can be酌情 (discretionarily) adopted. It must be understood that after suppuration, if there is an external head that can be punctured, it is a favorable sign; if it cannot be punctured externally, or if pus discharges through the urine, it is fatal. Generally, although named intestinal abscesses, these lesions mostly occur between the skin and fascia, allowing pus to discharge externally, which makes them easier to heal. If there is no external head, the lesion likely lies within the intestine; since the intestinal wall is thin, it is prone to rotting, constituting a malignant condition. Regarding large intestine abscesses discharging pus through stool, this is because internal Damp-Heat binding allows Fu Qi (Viscera Qi) to flow smoothly downward, expelling all turbid matter, thus allowing recovery. However, for pus discharging from within the umbilicus, the stool is necessarily constipated and blocked; pathogens exit upward, making it difficult to clear completely, leading to intestinal rot over time, hence incurable. For small intestine abscesses discharging pus through urine, this is because pathogens transmit to the Bladder for excretion, or perhaps Fu Qi fails to disseminate, preventing turbid matter from descending through the orifices, leading to righteous Qi deficiency and pathogen attachment, often resulting in death after prolonged duration.