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Blood and Qi are Yin and Yang; they are possessed by all people, regardless of gender or age. When people fall ill, they know to regulate Qi, but rarely consider Blood. When regulating Qi fails, treatments such as resolving phlegm (Xiao Tan) and driving out water (Zhu Shui) are employed to the extreme, yet the disease persists. This is because Blood is the culprit, lurking in the unseen and unfathomable depths. For instance, if a woman falls ill during her menstrual flow, there are indeed signs that can be verified and understood. However, what if the menses have been obstructed for a long time and do not flow, or if heat injures the blood due to combined pathogenic factors, leading to other syndromes? How should these be identified? Moreover, following世俗 conventions, who can diagnose Blood syndromes in men using the same methods as for women? The Liver stores Blood, while the Heart governs it. When active, Blood circulates through the meridians; when at rest, it returns to the Liver. When the Liver receives Blood, vision is enabled; when the feet receive Blood, walking is possible; when the palms receive Blood, grasping is possible; when the fingers receive Blood, holding is possible. Therefore, if Blood stagnates in the skin, Bi syndrome (Obstruction Syndrome) results; if it stagnates in the vessels, flow becomes sluggish (Qi); if it stagnates in the feet, Jue (Cold Extremities) occurs. Whenever there is mental confusion, fright and mania, chest oppression, thirst, vomiting, shortness of speech with internal pain, epistaxis (Niu Xue) or hemoptysis, red eyes and flushed face, bone fever and hot skin, foul intestinal discharge with frequent urination, chest fullness with stubborn phlegm, delirium with excessive sweating, or even cold extremities and unconsciousness, whether in men or women, these are all Blood syndromes. Examining the pulse, if Blood is involved, the pulse may be intermittent and rapid, flickering like light and shadow, or deep, fine, and hidden. If Blood and Heat attack each other, the Cun and Guan positions on the left hand will feel surging and excess upon pressure. This is because the Heart governs Blood and the Liver stores Blood, as stated. The Classics say: "When Blood rebels upward, forgetfulness occurs; when Blood accumulates downward, mania ensues." If there is Blood stasis in the Upper Jiao, urination will necessarily be difficult; if there is Blood stasis in the Lower Jiao, urination will necessarily be free. The location of Blood can be deduced from this. Xiao Chai Hu Tang (Minor Bupleurum Decoction), Xi Jiao Di Huang Tang (Rhinoceros Horn and Rehmannia Decoction), and Tao Ren Cheng Qi Tang (Peach Kernel and Cathartic Decoction), as recorded in *Huoren Zongguo*, are essential formulas for these conditions. For Blood knotting, adding vinegar to decoctions as an adjunct is particularly emphasized here. However, one must also know about Blood Bi, Qi Bi, and Wine Bi. Chronic alcohol consumption causes Blood to enter the Wine, forming Wine Bi; chronic emotional repression causes Blood to stagnate within Qi, forming Qi Bi; chronic deficiency-cold and wasting disorders cause failed Blood to transform, forming Blood Bi. These entities shake their heads and tails, moving like insects, invading the throat from above, eroding the anus from below, attaching to the back and flanks, or hiding in the chest and abdomen. They range in size from that of a turtle to that of a coin, which is truly strange. The treatment method involves frying and decocting *Melioidosis Fructus* (Wu Yi) for best effect, or grinding raw *Sulfur* (Sheng Liu Huang) into powder and taking it with aged wine. Both methods can neutralize their toxicity. Subsequently, Li Zhong Tang (Regulate the Middle Decoction) and Chen Xiang Jiang Qi Tang (Aucklandia Descending Qi Decoction) should be used in equal halves to warm the Stomach and benefit Blood, taken regularly to eliminate the excess pathogen. If one does not adhere to gentle and warming methods, but instead daily employs agents like *Allosciuriae Spermium* (Lei Wan) or Tin Ash, a gentleman cannot guarantee the outcome. (*Huoren Shu* states: In Taiyang syndrome of Cold Damage, epistaxis indicates the disease is about to heal. If Heat binds in the Bladder and Blood flows down spontaneously, it also indicates healing. From this perspective, in other diseases with latent Heat, vomiting caused by Upper Jiao Blood stasis also indicates improvement. Although Blood has been vomited, if it stops spontaneously, it is acceptable.)