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Note: The *Huangdi Neijing* (Yellow Emperor's Inner Canon) mentions Dian (epilepsy-like disorder with mental symptoms) but does not mention Xian (epileptic seizure). Ancient prescriptions sometimes combine Dian and Xian, or refer to Feng Xian (wind epilepsy), Feng Dian (wind Dian), or Dian Kuang (Dian and Kuang), with inconsistent references. Generally, Xian disease is attributed to the five Zang organs, while Dian disease is attributed to the Heart. Therefore, Feng Xian is now established as a separate category, while Dian and Kuang are combined into one category.

Individuals born with Dian disease: The *Neijing* states that this disease is named "Tai Bing" (fetal disease), acquired in the womb when the mother suffered a great fright. This caused Qi to rise and fail to descend, with essence and Qi accumulating together, leading the child to develop Dian disease. Because the pathology is located at the vertex of the head, it is called Dian. Treatment methods include: inducing vomiting to expel phlegm upwards; using heavy sedatives to suppress phlegm downwards; resolving phlegm internally to prevent Qi rebellion; or following methods for wind, cold, summer-heat, and dampness, using mild diaphoretic agents, and applying acupuncture and moxibustion to meridians in the Upper Jiao to guide Qi flow. All these can promote circulation in the meridians of the vertex, open the orifices, and prevent dizziness and vertigo.

Zhu Danxi said: Dian belongs to Yin, Kuang belongs to Yang. Dian patients often exhibit joy, while Kuang patients often exhibit anger. A deficient pulse indicates a treatable condition, whereas an excess pulse indicates a fatal prognosis. It is mostly due to phlegm knotting in the chest and heart. Treatment should calm the Spirit and resolve phlegm knots. Some cases result from pathogenic invasion, treated by dispelling pathogens. Dian involves the Spirit failing to reside in its abode, with delirious speech as if seeing things, persisting for years without cure, indicating damage to the Heart Meridian, constituting a true disease. If there is heat accumulation in the Heart Meridian, clear the Heart and remove heat. If phlegm confuses the Heart orifices, purge phlegm and calm the mind. If Dian presents with weeping and groaning, it is possession by evil, not Kuang; burn silkworm paper and administer with wine, one Fang Cun Bi (a small dose). Sudden Kuang with ghost-like speech stops upon needling below the nail of the thumb. For Dian disease, treating in spring leads to natural peace in summer; herbs tonifying Heart Qi are suitable.

Yang deficiency with Yin excess causes Dian; Yin deficiency with Yang excess causes Kuang. Profuse emesis and purgation are suitable to eliminate them. Furthermore: Kuang is due to excessive phlegm-fire excess; Dian is due to insufficient Heart blood. Dian involves much laughter and joy, yet still knowing fear, indicating a deficiency syndrome. Kuang involves much anger, uncontrollable by others, indicating an excess syndrome. The *Neijing* states: All Yang syndromes manifest as Kuang; all Yin syndromes manifest as Dian. Kuang disease is suitable for profuse emesis and purgation.

The *Neijing* states: Grief moving the interior damages Hun (Ethereal Soul). Damage to Hun leads to madness and lack of clarity; lack of clarity leads to impropriety. This is grief damaging Hun. Kuang should be treated with warm herbs to tonify the Yang of Hun, such as Zhongjing's Dihuang Tang (Rehmannia Decoction). It also states: Excessive joy damages Po (Corporeal Soul). Damage to Po leads to Kuang. Kuang patients have no regard for others. This is joy damaging Po. Treat with cool herbs to tonify the Yin of Po, such as Cinnabar (Zhensha), Curcuma Aromatica Rhizome (Yujin), and Alum (Baifan).

Kuang disease is characterized by little sleep. Little sleep causes Wei Qi (Defensive Qi) to circulate only in Yang and not in Yin, resulting in Yang excess and Yin deficiency. Treatment should induce mental dullness. Sleep allows Wei Qi to enter Yin. When Yin is filled by Wei Qi, it is no longer deficient; when Yang lacks Wei Qi support, it is no longer excessive. Thus, Yin and Yang become balanced and the patient recovers. The *Neijing* also states: Yang Jue (Jue syndrome of Yang) causes violent anger; drink Tie Luo Shui (Iron Filings Water). (Violent anger stems from hyperactive Liver Wood; Iron Filings are Metal, representing controlling Wood with Metal.) It also states: Depriving food cures it. Food enters Yin and generates Qi in Yang, so depriving food cures it. Thus, ancient texts describe treating Yang Jue Kuang with cursing relatives/strangers, crying or singing, weak pulses on palpation, body stiff as wood, and loud shouting during attacks. Based on the *Neijing* principle of "depriving food," the patient was not fed, but given Dachengqi Tang (Major Order the Qi Decoction) to purge. Several sheng of accumulated filth were expelled from the viscera, calming the Kuang slightly. Relapse occurred after several days. Purging was repeated five to seven times, excreting several dou of stool. The disease resolved, body temperature normalized, pulse returned, and recovery was achieved. This is the *Neijing*'s method of food deprivation. However, some cases arise from insufficient Heart blood, where the Spirit has no foundation, leading to initial mental emptiness and subsequent chaotic Spirit. These require tonification, not purgation.

Xian seizures occurring at dawn correspond to the Foot-Shaoyang Gallbladder Meridian; morning corresponds to Foot-Jueyin Liver Meridian; midday to Foot-Taiyang Bladder Meridian; dusk to Foot-Taiyin Spleen Meridian; midnight to Foot-Shaoyin Kidney Meridian. Add channel-guiding herbs according to symptoms. All belong to Phlegm-Heat, requiring no distinction between Yin and Yang, only deficiency and excess.

Dian, Xian, and Kuang differ significantly. Various books combine them without distinction, unaware that their manifestations and signs are different. Kuang is an acute disease; Dian is a chronic disease. Also, calling adults' Dian "Xian" and children's "Xian" is incorrect. Dian may present as manic or foolish, singing or laughing, grieving or weeping, like drunk or痴 (dull), speaking incoherently, unaware of cleanliness, persisting for years. It may be called "Shixin Feng" (Wind of Lost Heart), belonging to insufficient Heart blood and unfulfilled aspirations.

Kuang strikes suddenly, violently and aggressively, similar to Yangming excess in Cold Damage, with cursing, disregarding kinship, climbing high to sing, stripping clothes and running, jumping walls and roofs, exceeding normal strength, or discussing unseen events, as if possessed by spirits. Xian involves coma, loss of consciousness, dizziness, falling, convulsions, upward staring eyes, deviation of mouth and eyes, or sounds of livestock.

The *Neijing* states that Dian and Jue Kuang arise from long-term Qi reversal. In summary, indecision of Liver-Gallbladder planning, suppressed grievances, unvented anger, rising Wood fire, blazing Heart fire, Spirit failing to reside, or acquisition through fright, excessive thinking, daily depletion of Heart blood, stagnation of Spleen fluids, and phlegm confusing Heart orifices can all cause Dian and Kuang. Danxi stated: Heavy Yin leads to Dian (Yin), hence much joy; Heavy Yang leads to Kuang (Yang), hence much anger. Thus, Yin/Yang and Cold/Heat differ greatly. However, none do not stem from Heart Spirit dispersion, Qi deficiency failing to overcome dampness generating phlegm, and Yin deficiency failing to overcome heat generating fire. This is what the *Neijing* calls: If the Ruler (Heart) is unclear, the Twelve Officials are in danger; if the pathways are blocked, the form suffers greatly. Xian disease involves the five Zang organs, mostly deficiency, unlike Dian which is Heart-related and mostly excess. It arises from congenital or internal/external injuries, with pathogens deep in the root, harming the source of vital Qi. Pathogen and righteous Qi mix chaotically, Tian Shu fails to move, Wei Qi stays fixed in Yin and does not circulate. Non-circulation leads to Yin accumulation and fullness. Extreme depression leads to eruption. Upon eruption, Mingmen Minister Fire rises reversely from the Lower Jiao, blocking voice production, forcing out sounds like animal cries. Body lipids and Spleen saliva are forced upward, flowing from the mouth. Hundred vessels and sinews cannot withstand the counter-flow, causing sudden collapse and unconsciousness. Awakening occurs when fire qi subsides. If pathogens dissipate with the attack, recurrence is prevented. If pathogens remain, they confuse vital Qi. Even if pathogens retreat, if the source of vital Qi remains deficient and untreated, pathogens easily re-enter and recur. At the beginning of fetal formation, beside the seventh vertebral segment, behind the Mingmen acupoint and in front of the umbilicus, the fetus resides. The fetal umbilical cord attaches to the placenta, breathing with the mother. Mother exhales, fetus exhales; mother inhales, fetus inhales. It receives maternal vital Qi and grain Qi to transform and nurture internal and external forms, driven by the Moving Qi between the Kidneys. When the mother suffers fright pathogens, the fetus in the womb receives them through respiration, mixing with the Kidney Moving Qi. At birth, infant Yang Qi is like the rising sun, making pathogen entry difficult. Thus, Xian does not erupt until secondary pathogen infection occurs, where new pathogens deepen and clash with original womb pathogens. Regardless of adult or child, those with this disease, even if constitutionally strong, ultimately suffer harm to the life source from pathogens, rarely reaching middle age. Frequent eruptions with intellectual dullness lead to death around forty, as Yin Qi declines by half. Weak infants with staring eyes rarely survive to adulthood, as Kidney vital Qi is deficient and unrecoverable, preventing longevity. Pulses that are deep, small, rapid, or deficient and wiry indicate death.

Indeed, external pathogens invade by exploiting deficiency, and internal pathogens arise by exploiting deficiency. [Case] Treating a woman surnamed Zhang in the Banner household: Two months postpartum, she suddenly developed Dian disease, recurring for a long time without cure. Sometimes she refused food for days; other times ate double portions. Sometimes slept for days; other times stayed awake overnight. Her pulse fluctuated between surging and small; the Left Cun and both Chi positions were consistently weak. Phlegm-resolving, sedating, and Spirit-calming herbs failed. I reasoned that various manic and restless conditions relate to Fire. Er-Yin and One-Yang are the origin of Fire. Wisdom and storage are functions of the Kidney. Postpartum, Shaoyin is deficient. I prescribed Bawei Wan (Eight-Ingredient Pill) with Achyranthes Root (Niuxi) and Schisandra Berry (Wuweizi) in large doses, taken cold. Duck meat and pork elbows she consumed were boiled with Cinnamon Bark (Rougui) and eaten. After several days of this regimen, symptoms improved one day and remained unchanged the next. This indicated insufficiency of both Heart and Spleen, leading to illness due to excessive trust/reliance. Morning dosage: Modified Bawei Wan. Evening dosage: Guipi Tang (Restore the Spleen Decoction), removing Astragalus Root (Huangqi) and Aucklandia Root (Muxiang), adding White Peony Root (Baishao), Ophiopogon Tuber (Maidong), Schisandra Berry (Wuweizi), and Cinnamon Bark (Rougui). Gradual peace followed, with complete recovery after a month. Thus, for minor heat diseases, strengthening Water sufficiently controls it; this is direct treatment. For major heat diseases, where fire is rampant, immediate suppression causes harm; accommodating and controlling it is necessary, requiring indirect treatment. Especially since the Kidney is a Water organ and also a Fire organ. [Zhang] Whenever encountering toothache, eye disease, or sore throat with weak Chi pulses unresponsive to long-term treatment, Modified Bawei Wan is used in large, warm, copious doses, achieving instant recovery. Know that when Fire rests in its proper position, all phenomena are peaceful; this is indeed a golden rule.