经曰∶新积痛可移者，易已；积不痛，难已也。又曰∶胃之大络，名曰虚里，贯膈络肺，出于左乳下，其动
应衣，脉宗气也。结而横，有积矣。凡饮食之积，其渐积者，不过以饮食偶伤，必在肠胃之内，故可行可逐，治
无难也。惟饮食无节，以渐留滞者，多成癖积于左胁膈膜之间，此阳明宗气所出之道也。若饥饱无论，饮食叠进，
以致阳明胃气一有所逆，则阴寒之气得以乘之，而脾不及化，故余滞未消，并肠外汁沫搏聚不散，渐成 疾矣。
然其初起甚微，人多不觉，及其既久，则根深蒂固，而药饵难及。今西北小儿多有此疾，而尤于食面之乡为最，
正以面性多滞，而留积于皮里膜外，所以不易治也。惟当以渐消磨，求法治之，幸毋孟浪欲速，妄行攻击，徒致
胃气受伤，而积仍未及，以速其危也。
癖者，血膜化水则癖，胁旁时时作痛，时发潮热，或寒热往来似疟，故疟家多有此证。
凡疟疾发过之后，必令其热退极尽，方可饮食；若热未尽而饮食之，则中脘多蓄黄水，日久而成癖积。
小儿脏腑和平，脾胃壮实，则荣卫宣畅，津液流通，纵使多饮水浆，不能为病；惟脾胃不胜，乳哺失调，
三焦不运，水饮停滞，冷气搏之，结聚而成癖也。体素弱者消癖丸，气壮实者赭石挨癖丸。大约有癖之儿，虚
者居多，攻下之药，非可常用，即不得已而用之，待其略减，用消癖丸缓缓消之，至为良法。
《黄帝内经》说：新形成的积块，疼痛部位可以移动的，容易治愈；如果积块不痛，则难以治愈。又说：胃的大络脉，名叫虚里，贯穿膈肌联络肺脏，出于左侧乳下，跳动时能带动衣服，这是宗气的表现。如果搏动结聚而横向扩散，说明体内有积块。
凡是饮食停滞形成的积块，如果是逐渐积累的，通常只是偶然因饮食不当受伤，病位一定在肠胃内部，所以可以通过行气导滞或攻逐的方法治疗，并不困难。只有那些饮食没有节制，逐渐留滞体内的，多会在左胁肋和膈膜之间形成癖积，这里是阳明经宗气运行的通道。如果饥饱无常，饮食连续摄入，导致阳明胃气一旦上逆，阴寒之气就会趁机侵袭，脾脏来不及运化，因此残留的食滞未消，并与肠外的津液泡沫相互搏结凝聚不散，逐渐形成癖疾。
然而这种病初起时非常轻微，人们大多没有察觉，等到日久之后，病根深固，药物很难到达病所。现在西北地区的儿童多有此病，尤其在以面食为主的地方最为常见，正是因为面食的性质容易滞涩，且留积在皮肤与肌肉之间的膜外，所以不容易治疗。只应当慢慢消磨，寻求适当的方法治疗，千万不要鲁莽求快，妄用攻伐药物，徒然损伤胃气，而积块仍未消除，反而加速了危险。
所谓“癖”，是指血化为水膜则形成癖，表现为胁肋旁时常疼痛，有时出现定时发热（潮热），或者忽冷忽热像疟疾一样，所以患疟疾的人多有这种证候。
凡是疟疾发作过后，必须等热退干净后，才可以进食；如果热势未尽就进食，会导致中脘部蓄积黄水，时间久了就形成癖积。
小儿脏腑功能平和，脾胃强壮结实，那么营卫之气宣通畅达，津液流通无阻，即使喝很多水浆，也不会致病；只有当脾胃虚弱不胜任，乳哺喂养失调，三焦气化运行失常，水饮停滞，冷气与之搏结，凝聚而成癖疾。体质素来虚弱的小儿服用消癖丸，体质壮实的小儿服用赭石挨癖丸。大凡患有癖积的儿童，虚证的居多，攻下类药物不可常用，即使不得已使用，也要待病情稍减后，再用消癖丸缓缓消除，这才是很好的方法。
The *Classic of Difficult Issues* (or *Huangdi Neijing*) states: New accumulations that are painful and movable are easy to cure; accumulations that are painless are difficult to cure. It also states: The great collateral vessel of the stomach is named Xuli (虚里, located at the left apex beat), piercing through the diaphragm and connecting with the lungs, emerging below the left breast. Its pulsation moves the clothing, representing the Zongqi (宗气, Pectoral Qi). If the pulse knots and spreads horizontally, there is an accumulation.
Regarding accumulations caused by food stagnation, if they accumulate gradually due to occasional dietary injury, they remain within the intestines and stomach; thus, they can be treated by promoting qi movement or purging, making treatment straightforward. However, when dietary habits are irregular and stagnation accumulates slowly, it often forms "Pi Ji" (癖积, fixed abdominal masses) between the left hypochondrium and the diaphragm, which is the pathway where Yangming Stomach Zongqi emerges. Regardless of hunger or fullness, continuous intake of food causes Yangming Stomach Qi to rebel. Consequently, Yin-cold pathogens take advantage of this weakness, and the Spleen fails to transform them. The remaining stagnation does not dissipate but combines with the fluid foam outside the intestines, condensing and failing to scatter, gradually forming Pi disease.
Initially, the condition is very subtle and often unnoticed. After a long duration, the root becomes deep and firm, making medicinal therapy ineffective. This disease is common in children in the northwest regions of China, particularly in areas where wheat-based diets prevail. This is because wheat has a cloying nature, tending to stagnate in the interstitial spaces between skin and fascia, rendering it difficult to treat. Treatment should focus on gradual dissolution using appropriate methods. One must avoid rashness and haste, refraining from reckless attacking therapies that merely injure Stomach Qi without eliminating the accumulation, thereby hastening danger.
"Pi" refers to a condition where blood transforms into water membranes, causing pain in the hypochondriac region, periodic tidal fever (Chao Re), or alternating chills and fever resembling malaria. Therefore, patients with malaria often present with this syndrome.
After a malaria attack subsides, one must wait for the heat to completely dissipate before allowing food intake. If food is consumed while heat remains, yellow fluid accumulates in the Zhongwan (中脘, CV12) region, eventually forming Pi Ji over time.
Children with harmonious viscera and strong Spleen and Stomach function have smooth Ying and Wei (营卫, Nutrient and Defensive Qi) circulation and free-flowing body fluids. Even excessive consumption of water or milk will not cause disease. However, if the Spleen and Stomach are weak, breastfeeding or feeding is irregular, and the Sanjiao (三焦, Triple Burner) fails to transport, water-dampness stagnates. Combined with cold pathogens condensing together, Pi forms. For children with constitutionally weak bodies, Xiaopi Wan (消癖丸, Mass Dissolving Pill) is indicated; for those with robust constitutions, Zheshi Aipi Wan (赭石挨癖丸, Hematite Mass-Attacking Pill) is used. Generally, most children with Pi have deficiency patterns. Purging medications should not be used frequently. Even if necessary, after slight reduction of the pathogen, Xiaopi Wan should be used to slowly dissolve the accumulation, which is an excellent method.