孙真人云∶肠痈为病，小腹重强，按之则痛，小便如淋，时时汗出，复恶寒，身皮甲
错，腹皮急如肿，甚者腹胀大，转侧有水声。或绕脐生疮，或脓从脐出，或大便脓血。脉洪
数者，已有脓也，血下则安。若妄治者，必杀人。
陈无择曰∶肠痈为病，身甲错，腹皮急，按之濡，始肿状，腹无聚积，身无热。脉数
，此为肠内有脓，久积阴冷所成也，故《金匮》有用附子温之。其脉迟紧者，脓未成，可下
之，当有血。洪数者，脓已成，不可下，此以内结热所成也，故《金匮》有用大黄利之。
《千金方》灸法∶曲两肘，正肘头锐骨，灸百壮，下脓血而安。
一男子，里急后重，下脓胀痛，此脾气下陷也，用排脓散、蜡矾丸而愈。后因劳役，寒
热体倦，用补中益气汤而安。
一妇人，脓成腹胀痛，小便不利，脉滑数，此脓毒内溃也。服太乙膏三钱，脓下升许，
胀痛顿退。更以神效栝蒌散，二剂而全退。又以蜡矾丸及托里药，十余剂而安。
一产妇小腹疼痛，小便不利，以薏苡仁汤，二剂痛止。更以四物汤加桃仁、红花，下瘀血升许而愈。
一妇人产后恶露不尽，小腹患痛，服瓜子仁汤，下瘀血而痊。凡瘀血停滞，宜急治之，
缓则腐化为脓，最难治疗。若使流注骨节，则患骨疽，失治，多为败证。（薛按）
孙思邈说：肠痈这种病，表现为小腹部沉重僵硬，按压时疼痛，小便感觉像淋证一样（排尿涩痛），经常出汗，又怕冷，皮肤干燥粗糙如鳞甲交错，腹壁紧张像肿胀一样，严重的会出现腹部胀大，转动身体时有水声。或者肚脐周围生疮，或者有脓液从脐部流出，或者大便排出脓血。脉象洪大而数的，说明脓已经形成，如果血液（或脓血）下行排出则病情安定。如果误治，必然导致死亡。
陈无择说：肠痈这种病，身体皮肤干燥如鳞甲交错，腹壁紧张，按压时柔软，刚开始有肿胀的样子，腹部没有积聚块状物，身体没有发热。脉象数，这是肠内有脓，是由长期积聚的阴寒之气所形成的，所以《金匮要略》中有用附子来温阳的方法。脉象迟而紧的，说明脓尚未形成，可以用攻下法治疗，应当会有瘀血排出。脉象洪大的，说明脓已经形成，不可用攻下法，这是由内部结聚的热邪所形成的，所以《金匮要略》中有用大黄来通利泻热的方法。
《千金方》中的灸法：弯曲两肘，正对肘头突出的锐骨处，灸一百壮，排出脓血后病情安定。
有一个男子，出现里急后重（腹痛窘迫，时时欲便，肛门重坠，便出不爽），排出脓血且腹胀疼痛，这是脾气下陷所致，使用排脓散、蜡矾丸而痊愈。后来因为劳累过度，出现寒热交替、身体疲倦的症状，使用补中益气汤而安定。
有一个妇人，脓成导致腹部胀满疼痛，小便不通利，脉象滑数，这是脓毒在体内溃破所致。服用太乙膏三钱，脓液排出约一升左右，胀痛立刻消退。再用神效栝蒌散，服用两剂后症状完全消退。接着又服用蜡矾丸及托里药（具有扶正托毒外出作用的药物），经过十余剂治疗后病情安定。
有一个产妇小腹疼痛，小便不通利，使用薏苡仁汤，服用两剂后疼痛停止。再用四物汤加入桃仁、红花，排出瘀血约一升后痊愈。
有一个妇人产后恶露不尽，小腹患病疼痛，服用瓜子仁汤，排出瘀血后痊愈。凡是瘀血停滞的情况，应当紧急治疗，拖延则会腐败化为脓液，最难治疗。如果流注到骨节，则会患骨疽（生于骨与关节间的化脓性疾病），失治，多成为败证（危重的证候）。（薛己按语）
Sun Simiao stated: In the disease of intestinal abscess (Chang Yong), the lower abdomen feels heavy and stiff, pain upon pressure, urination resembles strangury (Lin syndrome) with difficulty and pain, frequent sweating occurs, accompanied by aversion to cold. The skin is dry and scaly like fish scales, the abdominal wall is tense as if swollen. In severe cases, the abdomen becomes distended and large, with a splashing sound heard when turning the body. There may be sores around the umbilicus, pus discharging from the umbilicus, or pus and blood in the stool. A surging and rapid pulse indicates that pus has already formed; if blood (or pus and blood) flows downward, the condition will stabilize. If treated erroneously, it will inevitably lead to death.
Chen Wuze stated: In the disease of intestinal abscess, the body skin is dry and scaly, the abdominal wall is tense but soft upon pressure, showing initial signs of swelling, without accumulations in the abdomen, and without fever. A rapid pulse indicates pus within the intestine, formed by long-standing accumulation of yin-cold. Therefore, *Jin Gui Yao Lue* (Essential Prescriptions of the Golden Cabinet) uses Fuzi (Prepared Aconite Root) to warm. A slow and tight pulse indicates that pus has not yet formed; purgation can be used, and blood should be discharged. A surging pulse indicates that pus has formed; purgation is contraindicated. This is caused by internal heat binding. Therefore, *Jin Gui Yao Lue* uses Dahuang (Rhubarb Rhizome) to promote drainage and clear heat.
The moxibustion method in *Qian Jin Fang* (Prescriptions Worth a Thousand Gold): Bend both elbows, locate the sharp bone at the tip of the elbow, and apply 100 moxa cones. After pus and blood are discharged, the condition stabilizes.
A male patient presented with tenesmus (urgent need to defecate with heavy sensation in the anus), discharge of pus and blood, and abdominal distension and pain. This was due to Spleen Qi sinking. He recovered after taking Paishao San (Drain Pus Powder) and Lafan Wan (Beeswax and Alum Pill). Later, due to overwork, he experienced alternating chills and fever and physical fatigue. He stabilized after taking Buzhong Yiqi Tang (Tonify the Middle and Augment the Qi Decoction).
A female patient had abdominal distension and pain due to formed pus, with difficult urination and a slippery, rapid pulse. This indicated internal rupture of pus toxin. She took Taiyi Gao (Great One Ointment), three qian, resulting in the discharge of about one sheng of pus, with immediate relief of distension and pain. Subsequently, Shenxiao Gualou San (Miraculous Trichosanthes Powder) was administered for two doses, leading to complete resolution of symptoms. Then, Lafan Wan and Tuoli medicines (medicines supporting the healthy qi to expel toxins) were taken for more than ten doses, leading to stabilization.
A postpartum woman suffered from lower abdominal pain and difficult urination. She was treated with Yiyiren Tang (Coix Seed Decoction); after two doses, the pain ceased. Then, Siwu Tang (Four Substance Decoction) was modified with Taoren (Peach Kernel) and Honghua (Safflower). After discharging about one sheng of stasis blood, she recovered.
A postpartum woman had lingering lochia and painful lower abdomen. She took Gua Zi Ren Tang (Melon Seed Decoction) and recovered after discharging stasis blood. Whenever blood stasis stagnates, urgent treatment is required; delay leads to putrefaction into pus, which is extremely difficult to treat. If it flows into the joints, it causes Gu Ju (bone abscess). Failure to treat properly often results in a fatal condition. (Commentary by Xue Ji)