杨氏曰∶慢惊之证，或因急惊过用凉药，或取下大过传变而成，或吐痢不止而得，或气
虚暴吐而成。有脏腑虚，洞泄成者，风邪入于肠胃，故大便不禁而痢。又有久痢胃气虚脱成者
，有伤寒传变阴证而成者。有得之久嗽成痫者。有下积峻取而成者，有吐血泻血而成者。
有感风不解，误药而成者。有得之发痫不已者，有得虫积冲心者，有卵肿疝气腹痛得之者，
有日夜盗汗，脾困多睡，烦躁引饮，四肢浮肿，大小便秘，丹瘤肿毒，龙带缠腰，走马急疳，
皆传慢候。惟吐泻积利成虚，治之则变证甚速。
慢惊者，因久吐泻而胃气渐虚。胃与肺，母子也，母虚亦令子衰。二经虚则生虚痰者，
肺胃所出也。痰则凝滞在于咽喉，如拽锯之声，时复螈 是也。
小儿因病后或吐泻，脾胃虚损，遍身冷，口鼻气出亦冷，手足时 螈，昏睡露睛，此无阳
也。急惊慢惊阴阳二证，切宜辨而治之。急惊合凉泻，慢惊合温补。世之俗医不知分别，
误死甚多。小儿伤于风冷，病吐泻。医谓脾虚，以温补之，不已，复以凉药治之，又不能已，
谓本伤风，复又攻之。脾气即虚，故大便不聚而成泻。当去脾风，风去则利止，宣风散主之，
使君子丸补其胃。亦有诸吐利久不瘥者，脾虚生风而成惊。
杨氏说：慢惊风的证候，有的因为急惊风时过度使用寒凉药物，有的因为攻下太过导致病邪传变而形成，有的因为呕吐腹泻不止而得病，有的因为气虚突然呕吐而成。有因脏腑虚弱、洞泄（严重腹泻）形成的，这是风邪侵入肠胃，所以大便失禁而痢疾。又有因长期痢疾导致胃气虚脱而形成的，有因伤寒病传变为阴证而形成的。有因久咳发展成痫证的。有因峻猛攻下积滞而形成的，有因吐血、便血而形成的。有感受风邪未解，误用药物而形成的。有因癫痫发作不止而得的，有因虫积上冲心胸而得的，有因睾丸肿胀、疝气腹痛而得的。还有日夜盗汗、脾困嗜睡、烦躁多饮、四肢浮肿、大小便不通、丹瘤肿毒、缠腰火丹（带状疱疹）、走马牙疳等，这些都会传变为慢惊风的证候。只有因吐泻积滞利下导致虚损的，治疗不当则变证发生得非常迅速。
所谓慢惊风，是因为长期呕吐腹泻导致胃气逐渐虚弱。胃与肺是母子关系，母脏虚弱也会导致子脏衰弱。这两经虚弱就会产生虚痰，这种痰是由肺和胃产生的。痰液凝滞在于咽喉，发出像拉锯一样的声音，时而出现抽搐，这就是慢惊风的表现。
小儿因病后或呕吐腹泻，导致脾胃虚损，全身发冷，口鼻呼出的气息也是冷的，手足时常抽搐，昏睡且眼睛半睁露出眼珠，这是阳气衰竭的表现。急惊风和慢惊风分别是阳证和阴证，必须仔细辨别并治疗。急惊风应当用寒凉泻下的方法，慢惊风应当用温补的方法。世间的庸医不知道分别，误治致死的人很多。小儿受风冷侵袭，生病出现呕吐腹泻。医生说是脾虚，用温补的方法治疗，如果不好，又用寒凉药治疗，还是不能痊愈，又说本是伤风，再次攻伐。脾气已经虚弱，所以大便不成形而变成腹泻。此时应当祛除脾风，风邪去除则腹泻停止，主方用宣风散，再用使君子丸补益胃气。也有各种呕吐腹泻长久不愈的，这是脾虚生风而导致的惊风。
脉象沉迟、散缓的是慢惊风。虎口脉络纹呈现青淡紫色，伸缩往来，主病为慢惊风。青紫或黑纹隐隐混杂，似出而未出，主病为慢脾风。
Yang stated: The syndrome of slow convulsion (Man Jing Feng) may arise from the excessive use of cooling herbs during acute convulsion (Ji Jing Feng), or result from transmission due to excessive purgation, or occur due to persistent vomiting and diarrhea, or develop from sudden vomiting caused by Qi deficiency. It can be formed by deficiency of the Zang-Fu organs and severe diarrhea (Dong Xie), where wind pathogen enters the intestines and stomach, causing incontinence of stool and dysentery. It can also be formed by chronic dysentery leading to exhaustion of Stomach Qi, or by the transmission of Cold Damage (Shang Han) into a Yin syndrome. It can develop from prolonged coughing evolving into epilepsy. It can result from harsh purgation of accumulated pathogens, or from hematemesis and hematochezia. It can be caused by unresolved wind pathogen combined with erroneous medication. It can arise from unceasing epileptic seizures, from intestinal parasites rushing to the heart, or from testicular swelling, hernia, and abdominal pain. Additionally, night sweats, spleen fatigue with excessive sleepiness, irritability with thirst, edema of the four limbs, constipation of both urine and feces, erysipelas-like swellings and toxic sores, herpes zoster (Dan Liu), and rapid-progressing cancrum oris (Zou Ma Ji Gan) can all transmit into the slow convulsion syndrome. Among these, only those becoming deficient due to prolonged vomiting, diarrhea, and accumulation are such that improper treatment leads to rapid development of complicated syndromes.
Slow convulsion is caused by prolonged vomiting and diarrhea gradually weakening Stomach Qi. The Stomach and Lung have a mother-son relationship; when the mother (Stomach) is deficient, it causes weakness in the son (Lung). Deficiency in these two meridians generates deficiency phlegm, which originates from the Lung and Stomach. This phlegm stagnates in the throat, producing a sound like sawing wood, accompanied by occasional twitching and convulsions.
In infants, after illness or due to vomiting and diarrhea, damage to the Spleen and Stomach results in coldness throughout the body, cold breath from the mouth and nose, intermittent convulsions of the hands and feet, lethargy with eyes half-open, indicating a lack of Yang. Acute and slow convulsions represent Yang and Yin syndromes respectively, requiring careful differentiation and treatment. Acute convulsion should be treated with cooling and purging methods, while slow convulsion requires warming and tonifying methods. Ignorant physicians of the world fail to distinguish between them, causing many deaths. When an infant contracts wind-cold and suffers from vomiting and diarrhea, if the physician diagnoses Spleen deficiency and treats with warming and tonifying herbs without improvement, then switches to cooling herbs without success, and further attacks under the assumption of initial wind injury, the Spleen Qi becomes deficient, leading to loose stools and diarrhea. At this stage, one should dispel Spleen wind; once the wind is eliminated, the diarrhea stops. The primary formula is Xuan Feng San (Disperse Wind Powder), followed by Shi Jun Zi Wan (Quince Seed Pill) to tonify the Stomach. There are also cases of prolonged vomiting and diarrhea that do not heal, resulting from Spleen deficiency generating wind and causing convulsions.
A deep, slow, scattered, and relaxed pulse indicates slow convulsion. A blueish-purple line on the Tiger's Mouth vein (Hu Kou Mai Wen), moving back and forth, indicates slow convulsion. Faintly mixed blue-purple or black lines, appearing as if emerging but not fully showing, indicate slow Spleen wind (Man Pi Feng).