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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: Improper diet and overexertion will injure the Spleen. If food intake doubles, the intestines and stomach will be damaged. The Spleen and Stomach are the officials responsible for receiving and rotting/ripening grain; the Large Intestine is the official responsible for conducting transmission. When food causes injury, Qi stagnation occurs; when Qi stagnates, it cannot distribute essence upwards nor transport waste downwards. However, there are injuries caused by cold-natured foods and those caused by heat-natured foods. Internally, these result merely in diarrhea or dysentery. If the pathology manifests in the eyes, injury from cold pathogens causes swelling of both eyelids, which should be treated with warming and resolving methods. Injury from heat pathogens causes redness, itching, and pain of the eyes, which should be treated with clearing and draining methods. Overconsumption of fried, roasted, or grilled foods inevitably leads to fire qi attacking upwards, resulting in conditions such as "chicken crest clam flesh" (a type of ocular pterygium or fleshy growth) or "fish roe pomegranate" (another type of ocular growth), with various manifestations. Treatment should focus on clearing and draining the intestines and stomach, removing accumulated heat, thereby eliminating all diseases. These cases are relatively easy to treat. Such conditions are most common in youths and children. In contrast, elderly individuals or those with chronic illnesses suffer from Spleen deficiency failing to transform and transport, manifesting as inability to eat, feeling hungry but eating little, or immediate abdominal distension after eating. These are clearly signs of Middle Jiao deficiency, requiring tonification methods. Wise practitioners do not remain rigid and inflexible.

The *Huangdi Neijing* states: For Wood depression, promote its free flow; for Fire depression, vent it; for Earth depression, purge it; for Metal depression, drain it; for Water depression, control it. This refers to the depression of the Five Qi. The human Zang-Fu organs correspond to these: Wood corresponds to the Liver and Gallbladder; Wood governs Wind pathogens and fears stagnation, so it is appropriate to promote its free flow. Fire corresponds to the Heart and Small Intestine; Fire governs Heat pathogens and fears sinking/trapping, so it is appropriate to vent it. Earth corresponds to the Spleen and Stomach; Earth governs Damp pathogens and fears obstruction/stagnation, so it is appropriate to purge it. Metal corresponds to the Lung and Large Intestine; Metal governs Dryness pathogens and fears restlessness/haste, so it is appropriate to drain it. Water corresponds to the Kidney and Bladder; Water governs Cold pathogens and fears coagulation/overflow, so it is appropriate to control it. However, among these five, flexibility and adaptability are possible; one need not be dogmatic. Generally, if a person's Qi and Blood are not smooth and the pulse is not harmonious, this constitutes Depression Syndrome (Yu Zheng), which is depression caused by disease. As for emotional depression, there are three types: First, Anger Depression. When one is arrogant and imposing, with a red face and harsh voice, abdominal distension is often seen. After the anger subsides, although the rebellious Qi calms down, the Middle Qi is injured, leading to symptoms of distension, fullness, pain, fatigue, and reduced appetite. Second, Pensive Depression. This affects scholars, travelers, young unmarried women, and nuns who harbor memories that generate intent, and intent that generates thought. When thoughts are unfulfilled, depression forms. If knotted in the Heart, it inevitably damages the Spleen; when severe, it connects upward to the Lung and Stomach, causing cough, asthma, hemoptysis, dysphagia, and vomiting; downward to the Liver and Kidney, causing leukorrhea, turbid urine, metrorrhagia, menorrhagia, amenorrhea, and consumptive disease. Third, Melancholy Depression. Caused by burdens of livelihood or entanglements of profit and loss, one frowns daily, leading to depression. Will and intention go against norms, spirit and demeanor become desolate. The Heart and Spleen gradually deteriorate, Qi and Blood diminish day by day, food intake decreases, muscles waste away, eventually leading to eye disorders. This was detailed in the previous discussion on Seven Emotions, so it is not repeated here. Thus, the depression of the Five Qi is disease-caused depression, whereas emotional depression is depression-causing disease. Those suffering from this condition should exercise self-restraint, as herbal medicines alone cannot achieve efficacy; as the saying goes, "Miraculous drugs cannot cure the disease of the mind." Can one not be cautious?