虎口者，叉手处是也。
三关者，二指三节是也。
风关，第一节寅位是也。
气关，第二节卯位是也。
命关，第三节辰位是也。
辰关，指头上节。
卯关，指中节。
1.风关(寅位) 2.气关(卯位) 3.命关(辰位) 4.虎口
男以左手测看之。女以右手测看之。
图：指掌图形
寅关，指下节。
命关死候。
气关病深。
风关易治。
末关命门。
中关气候。
初关风侯。
凡婴儿生下一月至三岁以前，须着虎口脉次指，辰节为命
关，次气关，次风关。所渭初得风关，病犹可，传入气命，病难
存(3)。汤氏云：小儿初生至五岁，血气未定，呼吸至数太过，必
辨虎口脉色，方可察病之的实。男验左手，女验右手。盖取左手
属阳。男以阳为主，右手属阴，女以阴为主。然男女一身均具此
阴阳，左右两手亦当参验。左手之纹，病应心肝;右手之纹，病
应肺脾。知此捎息，又得变通之意。惊风初得，纹出虎口。或在
初关，多是红色。传至中关，色赤而紫。看病又传过，其色紫
青，病势深重;其色青黑而纹乱者，病深重。若见纯黑，危恶不
治。大抵红者风热轻，赤者风热甚，紫者惊热，青者惊积。青赤
相半，惊积风热俱有，主急惊风。青而淡紫，伸缩来去，主慢惊
风。或紫系。青系、黑系，隐隐相染(4)，似出不出，主慢脾风。
脉纹从寅关起，不至卯关者，病易治。若连卯关者，有病难治。
如寅关连卯关，侵过辰关者，十难救一。若脉纹小或短者，看病
不妨。如纹势弯曲入里者，病势虽重而症顺，犹可用力。纹势湾(5)
反出外，骎骎靠于指甲者，断不可回。其有三关纹，如流珠流
来，三五点相连，或形于面，或形于身，危恶尤甚。
The Tiger's Mouth refers to the area where the thumb and index finger cross when hands are clasped.
The Three Passes (San Guan) refer to the three segments of the second finger (index finger).
The Wind Pass (Feng Guan) is the first segment, corresponding to the Yin position in Earthly Branches.
The Qi Pass (Qi Guan) is the second segment, corresponding to the Mao position in Earthly Branches.
The Life Pass (Ming Guan) is the third segment, corresponding to the Chen position in Earthly Branches.
The Chen Pass refers to the distal phalanx (tip segment) of the finger.
The Mao Pass refers to the middle phalanx (middle segment) of the finger.
1. Wind Pass (Yin Position) 2. Qi Pass (Mao Position) 3. Life Pass (Chen Position) 4. Tiger's Mouth
For males, examination is performed on the left hand. For females, examination is performed on the right hand.
Diagram: Illustration of Finger and Palm Patterns.
The Yin Pass refers to the proximal phalanx (base segment) of the finger.
Abnormalities at the Life Pass indicate a fatal prognosis.
Abnormalities at the Qi Pass indicate deep-seated disease.
Abnormalities at the Wind Pass are easy to treat.
The terminal pass corresponds to the Gate of Vitality (Ming Men).
The middle pass corresponds to the climate (disease progression).
The initial pass corresponds to wind pathogens (etiology).
For infants from one month old up to three years of age, the pulse pattern on the index finger at the Tiger's Mouth must be observed. The third segment is the Life Pass, followed by the Qi Pass, and then the Wind Pass. It is said that if the pattern appears only at the Wind Pass initially, the condition is manageable; however, if it spreads to the Qi and Life passes, the condition becomes difficult to save. Mr. Tang stated: From birth to five years of age, a child's blood and qi are not yet stable, and their respiratory rate is relatively high. Therefore, one must distinguish the color of the Tiger's Mouth pulse pattern to accurately diagnose the disease. Males are examined on the left hand, and females on the right hand. This is based on the principle that the left hand belongs to Yang, and males are primarily governed by Yang; the right hand belongs to Yin, and females are primarily governed by Yin. However, both males and females possess Yin and Yang throughout their bodies, so both left and right hands should be consulted for verification. Patterns on the left hand correspond to diseases of the Heart and Liver; patterns on the right hand correspond to diseases of the Lungs and Spleen. Understanding these principles allows for flexible application. When convulsive disorders (Jing Feng) first appear, the pattern emerges at the Tiger's Mouth. If located at the initial pass, it is mostly red. If transmitted to the middle pass, the color becomes crimson-purple. If the disease progresses further, the color turns purple-green, indicating severe illness; if the color is cyan-black with chaotic lines, the disease is deep and severe. If pure black is seen, the condition is critical and untreatable. Generally, red indicates mild wind-heat; crimson indicates severe wind-heat; purple indicates heat from fright; cyan indicates accumulation due to fright. Equal parts of cyan and crimson indicate both fright-accumulation and wind-heat, pointing to acute convulsions (Ji Jing Feng). Cyan with pale purple, moving back and forth, points to chronic convulsions (Man Jing Feng). Purple, cyan, or black lines, faintly intermingled and seemingly emerging but not fully, point to chronic Spleen wind (Man Pi Feng). If the pulse pattern starts at the Yin Pass and does not reach the Mao Pass, the disease is easy to treat. If it connects to the Mao Pass, the disease is difficult to treat. If the Yin Pass connects to the Mao Pass and invades beyond the Chen Pass, fewer than one in ten can be saved. If the pulse pattern is small or short, it does not necessarily hinder the assessment of the condition. If the trend of the line curves inward, although the condition is severe, the symptoms are favorable, and treatment efforts can still be effective. If the trend of the line curves outward, rapidly approaching the fingernail, recovery is deemed impossible. If there are patterns across all three passes, resembling flowing pearls connected in groups of three to five, or appearing on the face or body, the critical nature is even more severe.