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Abdominal fullness in Shanghan (Cold Damage) disease. How can this be elucidated? Abdominal fullness is commonly referred to as abdominal distension. Hua Tuo stated: On the first day of Shanghan, the pathogen is in the skin; on the second day, in the flesh; on the third day, in the muscles; on the fourth day, in the chest; on the fifth day, in the abdomen; on the sixth day, it enters the stomach. "Entering the stomach" refers to entering the fu organs (Hollow Organs). At this stage, although the pathogen is in the abdomen, it has not yet fully entered the interior. Although abdominal fullness is a sign of an interior syndrome, there are still distinctions between shallow and deep levels. The Classics state: If the exterior is resolved but the interior accumulation remains, unless it is a case of severe fullness, chills and fever will persist, and the disease will not be cured. This indicates that the pathogen has not fully entered the fu organs. However, if there is severe fullness and excess, with hardness and dry feces, purgation (downward draining) can naturally be applied. Even if the disease has lasted four or five days, it will not cause harm; this is called the pathogen having entered the fu organs. When the Shanghan pathogen enters the abdomen, the interior syndrome is already deep-seated; therefore, abdominal fullness is often treated with purgation. As the Classics state: If there is no tidal fever, one should not administer Chengqi Tang (Order the Qi Decoctions) prematurely. If the abdomen is significantly full and obstructed, Xiao Chengqi Tang (Minor Order the Qi Decoction) may be given. If sweating fails to resolve the condition and abdominal fullness and pain occur, urgent purgation is required. In a Taiyang Disease (Exterior Syndrome), if the physician erroneously applies purgation, leading to abdominal fullness and intermittent pain, it belongs to Taiyin Disease (Interior Cold-Deficiency Syndrome). It should be treated with Guizhi Jia Shaoyao Tang (Cinnamon Twig Decoction plus Paeonia Root). In cases of severe excess pain, Guizhi Jia Dahuang Tang (Cinnamon Twig Decoction plus Rheum Rhizome) is indicated. In Shaoyin Disease (Interior Heat/Cold Syndrome), if abdominal distension and constipation occur, urgent purgation is required. All such cases belong to interior syndromes.

Although abdominal fullness and pain generally indicate excess patterns requiring downward elimination, persistent abdominal fullness without relief signifies excess, whereas abdominal fullness that intermittently relieves itself indicates deficiency, for which purgation is contraindicated. The Classics state: Abdominal fullness that does not relieve itself, even slightly, requires purgation. *Jingui Yaolue* states: Abdominal fullness that intermittently relieves itself only to return to its previous state is caused by deficiency-cold rising from below; it should be harmonized with warm herbs. This is because stagnant deficient qi also causes distension, though it is not as hard and painful as in excess patterns. Generally, abdominal fullness belongs to Taiyin patterns. If yang-heat pathogens cause the condition, there is abdominal fullness accompanied by a dry throat. If yin-cold pathogens cause it, there is abdominal fullness accompanied by vomiting, inability to eat, worsening spontaneous diarrhea, and frequent spontaneous abdominal pain. Taiyin corresponds to the spleen earth, which governs the center; thus, it specifically manifests as abdominal fullness.

Furthermore, abdominal fullness arising after sweating, vomiting, or purging is caused by pathogens invading due to deficiency, yet the treatments differ. The Classics state: For abdominal fullness after sweating, Noupо Shengjiang Gancao Banxia Renshen Tang (Magnolia Bark, Fresh Ginger, Licorice, Pinellia, and Ginseng Decoction) is indicated. For abdominal fullness after vomiting in Shanghan, Tiaowei Chengqi Tang (Harmonize the Stomach Order the Qi Decoction) is indicated. For restlessness, abdominal fullness, and inability to lie down comfortably after purging in Shanghan, Zhizi Noupо Tang (Gardenia and Magnolia Bark Decoction) is indicated. These three cases require warming, purging, or inducing vomiting respectively. Why do the treatments for pathogens differ?

For instance, abdominal fullness after sweating should be treated with warming dispersion. Since the pathogen was in the exterior, dispersing removes it. The stomach is the master of fluids and electrolytes; excessive sweating depletes yang qi, causing stomach qi deficiency and failure to distribute qi, leading to stagnation and distension. Thus, warming dispersion is appropriate. Abdominal fullness after vomiting may be treated with purging. If the pathogen was in the chest, vomiting removes it. If vomiting fails to remove the pathogen and abdominal fullness ensues, it means the chest pathogen has descended into the stomach, causing obstruction and excess, resulting in distension; thus, purging is required. Abdominal fullness after erroneous purging may be treated with inducing vomiting. If the pathogen was in the exterior and had not entered the fu organs, but purging was wrongly applied, the pathogen enters via the deficiency, stagnates in the chest, causing empty irritability, and blocks the free flow of qi up and down, leading to abdominal fullness; thus, inducing vomiting is appropriate.

Physicians must identify the origin and location of the pathogen. By examining its origin, one understands its source; by observing its location, one discerns its excess or deficiency nature. If sweating, vomiting, or purging fails to cure, and warming, tonifying, acupuncture, and moxibustion are applied appropriately, perfect healing can be achieved.