The Middle Jiao (Central Burner) serves as the connecting bridge between the Upper and Lower Jiao in the human body. It is both the core of digestion and absorption and a critical pivot for the ascending and descending movement of Qi. Once the Middle Jiao becomes obstructed, it not only affects the generation of Qi and Blood but can also trigger issues like gastric distension, indigestion, diarrhea, or constipation. Moreover, it can lead to Qi stagnation, which subsequently influences emotions, resulting in discomforts such as anxiety and depression.

Many people, upon perceiving physical weakness, blindly attempt to tonify Qi or strengthen the Spleen. However, they may not realize that when the Middle Jiao is obstructed, "tonification can backfire and worsen the condition"—in such cases, supplementation is not only ineffective but can also lead to a state of "deficiency being unable to receive tonification." For instance, individuals with Qi and Blood deficiency may find that even slightly consuming tonifying foods or herbs exacerbates symptoms of excessive internal heat ("Shanghuo").

To improve Middle Jiao obstruction, it is essential to first address the root cause according to the specific pattern. Common underlying causes primarily fall into three categories: Phlegm-Dampness, Cold Coagulation, and Liver Depression. Correspondingly, there are three classic renowned formulas:

Wen Dan Tang (Pinellia, Bamboo Shavings, Immature Bitter Orange, Dried Tangerine Peel, Poria, Licorice, Fresh Ginger, Jujube): Suitable for those with heavy spleen and stomach burden and phlegm-damp accumulation due to improper diet. It can improve problems such as oily face, chest tightness, fatigue, excessive phlegm, and abdominal distension. It is necessary to resolve phlegm and eliminate dampness before tonifying.

Xiao Yao San (Bupleurum, Chinese Angelica, White Peony Root, White Atractylodes, Poria, Honey-Fried Licorice): Targets liver depression affecting the spleen and liver Qi invading the stomach. It can relieve discomforts such as poor temper, dry mouth with bitter taste, and chest tightness. By soothing the liver to relieve depression, nourishing blood, and strengthening the spleen to unblock the Qi movement in the Middle Jiao, then consider tonifying.

Fu Zi Li Zhong Tang (Prepared Aconite, Ginseng, White Atractylodes, Licorice, Dried Ginger): Suitable for those who frequently consume cold and raw foods, damaging spleen Yang. It can improve symptoms such as abdominal pain, abdominal distension, belching, and diarrhea caused by Yang deficiency generating cold and cold congealing in the Middle Jiao. It is necessary to warm the middle and dissipate cold first, then proceed with tonifying deficiency.