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Bi syndrome (Obstruction Syndrome) is formed by the combined invasion of Wind, Cold, and Dampness pathogens. Its manifestations include numbness or pain in the muscles. This occurs because the body's healthy Qi is deficient, causing the Couli (pores and skin texture) to open, allowing Wind pathogen to enter.

The pathogen first affects the Meridians and Collaterals, then enters the Zang organs. If Bi syndrome is contracted in Spring, it is called Jin Bi (Sinew Bi), characterized by stiffness of tendons and joints. If Jin Bi persists and is re-infected by pathogens, it transmits to the Liver, forming Gan Bi (Liver Bi). The symptoms of Gan Bi include waking up with fright during sleep, increased food intake but frequent urination. If contracted in Summer, it is called Mai Bi (Vessel Bi), where blood vessels do not flow smoothly, leading to sallow complexion. If Mai Bi persists and is re-infected, it transmits to the Heart, forming Xin Bi (Heart Bi). Symptoms of Xin Bi include palpitations like a drum beating under the heart, sudden upward reversal of Qi causing asthma, dry throat, and a tendency to belch. If contracted in Late Summer, it is called Ji Bi (Muscle Bi). If Ji Bi persists and is re-infected, it transmits to the Spleen, forming Pi Bi (Spleen Bi). Symptoms of Pi Bi include flaccidity and weakness of the four limbs, coughing, and vomiting. If contracted in Autumn, it is called Pi Bi (Skin Bi), characterized by total loss of sensation in the skin. If Skin Bi persists, it transmits to the Lung, forming Fei Bi (Lung Bi). Symptoms of Fei Bi include rapid breathing, asthma, and pain. If contracted in Winter, it is called Gu Bi (Bone Bi), characterized by heavy bones that cannot be lifted, immobility, and pain. If Gu Bi persists and is re-infected, it transmits to the Kidney, forming Shen Bi (Kidney Bi). Symptoms of Shen Bi include abdominal distension. Pulse diagnosis for these conditions: a large and choppy pulse indicates Bi; a rapid pulse indicates Bi; a choppy and tight pulse also indicates Bi (Same source as above).

Medical classics mention the presentation of Pian Feng (Hemiplegic Wind), Ban Shen Bu Sui (Hemiplegia), and Feng Pian Ku (Wind-induced Wasting). These three are essentially similar, but ancient texts separated them into different chapters: referring to the etiology as Wind implies Pian Feng; referring to the disease manifestation as inability to move half the body implies Ban Shen Bu Sui; referring to the wasting of muscles on one side implies Pian Ku. All are caused by deficiency and weakness of the Spleen and Stomach. The Spleen and Stomach are the sea of water and grain; the essence of food and drink transforms into Blood and Qi to nourish the body. Now, due to Spleen and Stomach deficiency, the nourishment from food essence is insufficient, leading to partial deficiency of Blood and Qi, which allows pathogens to strike. Thus, hemiplegia occurs, potentially progressing to muscle wasting. The treatment method should address both the primary condition and regulate the Spleen and Stomach (All from Jifeng Fang).

"Wind Yin Mo Ji" refers to diseases of the extremities. In all cases of Zhong Feng (Wind Strike/Stroke), the pathogen returns to the hands and feet. The severity of the disease varies. Therefore, mild cases are commonly known as Xiao Zhong (Minor Stroke). An old physician often argued that Xiao Zhong does not require aggressive deep treatment. One should only take mild and balanced decoctions to support Healthy Qi, expel Damp-Bi, and divert toxins to one side, so that other suffering ceases. The patient should follow their nature and rest. Although full recovery may not be achieved, life can still be prolonged. If one attacks the pathogen forcefully, even if there is temporary remission, the patient often becomes complacent and unguarded. If the disease recurs, it will be difficult to manage. It is like capturing a bandit: confining him in a room prevents him from escaping and plotting elsewhere; driving him out means he will return, and the disaster will be worse than before. This statement is very reasonable. However, I see that most patients in the world are like this. Ordinary people, attached to their illusory bodies, rarely refrain from vigorous treatment when disabled by illness. This is difficult to explain merely with words and writing (From Bo Zhai Bian).