1, When pathogenic factors invade the interior from the exterior, if the treatment is not appropriate and excessive purgation is used, the spleen and stomach will be damaged. Pathogenic factors take advantage of the vulnerability to invade the interior, congeal in the epigastrium, block the middle-jiao qi, disrupt the coordination of ascending and descending, retain stomach qi, and eventually lead to fullness and distension. As stated in 'Treatise on Cold Damage': 'If the pulse is floating and tense, and purgation is repeated, the tense will enter the interior, causing fullness and distension, pressing on it feels soft, but it is only qi fullness.',
2, Overeating, overindulgence in cold and rough foods, preference for fatty and sweet foods, or excessive consumption of strong tea, spirits, and spicy and hot foods can damage the spleen and stomach, leading to indigestion, obstruction in the epigastrium, loss of coordination in ascending and descending, retention of stomach qi, and eventually causing fullness and distension. As stated in 'Similarity Treatment Compilation - Fullness and Distension': 'If the stomach is injured by cold and cool foods and leads to fullness and distension, warm the middle to transform stagnation.
3. Obstruction of phlegm and dampness in the spleen and stomach The spleen and stomach lose their healthy function, water and dampness are not transformed, leading to the generation of phlegm turbidity, and the obstruction of phlegm and qi in the epigastrium leads to the failure of ascending and descending, obstruction of stomach qi, and the formation of distension. As stated in 'The Secret Vault of Orchid Room - Abdominal Distension and Swelling': 'Excess dampness in the spleen, abdominal fullness and indigestion.'
4. Imbalance of emotions Overthinking leads to qi stagnation, sudden anger leads to qi reversal, sadness and worry lead to qi depression, and fear and惊恐 lead to qi chaos, etc., causing the reverse of qi movement, the failure of ascending and descending, and the formation of distension. Among them, the most common is the distension caused by liver depression and qi stagnation, which invades the spleen and stomach, leading to the obstruction of stomach qi. As described in 'The Complete Works of Jingyue - Distension': 'Sudden injury of anger, liver qi not calm and distension.'
5. Weakness of the spleen and stomach from birth The body is inherently weak in the spleen and stomach, with insufficient middle qi, or irregular eating and drinking, unbalanced diet, or long-term illness damaging the spleen and stomach, leading to the failure of intake and transportation, imbalance of ascending and descending, obstruction of stomach qi, and the generation of distension. This is as discussed in 'The Secret Vault of Orchid Room - Abdominal Distension and Swelling': 'Or, due to overeating of cold and cool foods, or people with long-term deficiency of the spleen and stomach, the stomach becomes cold and distended, or internal cold generates distension disease.'
The pathogenesis of gastric distension is divided into deficiency and excess. Excess refers to internal obstruction of pathogenic factors, including external pathogenic factors entering the interior, food stasis, phlegm-damp obstruction, and liver depression and qi stagnation; deficiency refers to the failure of the middle burner, attributed to the weakness of the spleen and stomach. The internal obstruction of excess pathogenic factors is often related to the failure of the middle burner and the lack of ascending and descending power; conversely, the lack of power in the middle burner is most susceptible to the invasion of excess pathogenic factors, and both often cause each other. For example, if the spleen and stomach are weak and the healthy function is lost, it can lead to the retention of dampness and the generation of fluid, as well as the retention of food in the interior; while the internal obstruction of excess pathogenic factors will further damage the spleen and stomach, eventually leading to the coexistence of deficiency and excess. In addition, various pathogenic factors and various pathogenic mechanisms can also influence and transform each other, forming a pathological change of intermingling deficiency and excess, and cold and heat, which is a characteristic of the pathogenesis of distension. In summary, the location of gastric distension is in the stomach, and it is closely related to the liver and spleen. The basic pathogenesis is the dysfunction of the spleen and stomach, the loss of ascending and descending, and the obstruction of stomach qi.