🌿 Folk Prescriptions

The angle, direction, and depth of acupuncture refer to specific operational requirements after the needle enters subcutaneously. Mastering correct angle, direction, and depth during acupuncture is crucial for obtaining needle sensation, applying tonification and drainage techniques, achieving therapeutic effects, enhancing treatment outcomes, and preventing acupuncture accidents.
Correct acupoint selection involves not only surface anatomical positioning but also integration with appropriate angle, direction, and depth to fully realize the therapeutic function of acupoints. Thus, acupoints should not be viewed simply as small dots but as three-dimensional structures.
In clinical practice, different angles, directions, and depths when needling the same acupoint result in variations in targeted tissues, needle sensations, and treatment outcomes.
For clinicians, proficiency in acupuncture operations is closely tied to their ability to properly control angle, direction, and depth. The choice of angle, direction, and depth depends on the site, treatment needs, and patient’s physique and body shape, requiring flexible adaptation.
One: Acupuncture Angle
Acupuncture angle refers to the angle formed between the needle shaft and the skin surface. Its size varies according to acupoint location, disease nature/position, and technique requirements. Angles are generally categorized as vertical, oblique, and horizontal.
1. Vertical Insertion: The needle shaft forms a 90° angle with the skin, inserted vertically into the acupoint. Suitable for most acupoints, especially those over thick muscles.
2. Oblique Insertion: The needle shaft forms approximately a 45° angle with the skin, inserted obliquely into the acupoint. Used for shallow skin areas, regions with important internal organs, or acupoints unsuitable for deep vertical insertion—commonly used in joints and for certain qi-regulating or qi-balancing techniques.
3. Horizontal Insertion (also called transverse or subcutaneous insertion): The needle shaft forms about a 15° angle with the skin, inserted horizontally into the acupoint. Applicable to acupoints in thin-skinned, low-fat areas. Commonly used in scalp, facial, and sternal regions. Techniques such as trans-acupoint insertion, scalp acupuncture, and wrist-ankle acupuncture also employ horizontal insertion.
Two: Acupuncture Direction
Acupuncture direction refers to the orientation of the needle tip during insertion and afterward—simply called "needle direction." Direction is determined based on meridian course, acupoint distribution, and target tissue. While related to angle—for example, facial acupoints often use horizontal insertion, neck and throat acupoints prefer oblique insertion, midline chest acupoints favor horizontal insertion, lateral chest acupoints use oblique insertion, abdominal acupoints typically use vertical insertion, back and waist acupoints usually use oblique or vertical insertion, and limb acupoints generally use vertical insertion—angle primarily depends on anatomical features of the site, whereas direction is tailored to specific therapeutic needs.
Take Jia Che Point as an example: When treating jaw disease, cheek pain, or locked jaw, insert the needle obliquely toward the temporal region to radiate sensation throughout the cheek. For facial paralysis or facial deviation, insert horizontally toward the mouth corner. For mumps, insert obliquely toward the parotid gland. For toothache, use vertical insertion.
Three: Acupuncture Depth
Acupuncture depth refers to how deeply the needle penetrates the skin and flesh of the acupoint. Proper depth should achieve needle sensation ("de qi") without damaging underlying tissues or organs. Actual depth must consider patient age, constitution, condition, acupoint location, meridian depth, seasonal timing, practitioner skill, and needling goals—all integrated flexibly. As stated in *Suwen·Needling Essentials*: "Needling has varying depths, each suited to its purpose... Incorrect depth becomes a great harm," emphasizing the importance of appropriate depth.
To correctly master acupuncture depth, pay attention to the following aspects.
1. Age: *Lingshu·Reverse and Forward, Fat and Thin* says: "For infants and thin individuals, insert shallow and quickly; for robust adults and fat individuals, insert deep and leave longer." Elderly or frail patients with weakened qi and blood, and delicate infants, should avoid deep insertion. Young adults with strong qi and blood may tolerate deeper insertion.
2. Body Build: Patient’s physique and build vary in fatness and strength. *Suwen·Three Departments Nine Observations* states: "First assess body type to adjust qi deficiency or excess." Zhang Zhicong said: "Knowing body type reveals appropriate needle depth." Thus, thin and weak individuals should receive shallower insertion; robust individuals may tolerate deeper insertion.
3. Location: Acupoints on head, face, and back should be shallowly inserted; acupoints on limbs and buttocks may be deeper.
4. Meridians: Meridians vary in depth and nature—yin or yang. Ancient texts suggest deeper insertion for deeper meridians, shallower for superficial ones; yang meridians (surface) should be shallowly inserted, yin meridians (interior) deeply. As *Lingshu·Yin-Yang Purity and Impurity* notes: "Needle yin deeply and leave it; needle yang shallowly and quickly." Generally, meridians running through elbow/arm and knee/leg areas are deeper, requiring deeper insertion; those in wrist/ankle and finger/toe areas are shallower, requiring shallower insertion.
5. Condition: *Lingshu·Deficiency and Excess of Defensive Qi* states: "Disease manifestations vary in depth and location—each has its own place. Mild cases require shallow insertion, severe cases deep insertion; mild cases use fewer needles, severe cases more. Adjust treatment according to changes." *Lingshu·End and Beginning* adds: "For solid pulses, deep insertion to release qi; for vacuous pulses, shallow insertion to preserve essence and avoid losing qi, nourish the pulse, expel pathogenic factors." This emphasizes that depth must be adapted to disease nature and mechanism.
6. Technique: *Medical Gate Entry* says: "Tonification draws qi from Wei (defensive) to supplement deficiency—light, shallow needles, following Wei qi behind. Drainage discards qi from Ying (nutritive) to remove excess—deep, heavy insertion, meeting Ying qi ahead to drain excess." *Nanjing* states: "Needle Ying without harming Wei, needle Wei without harming Ying." Both emphasize precise control of depth in techniques—appropriate depth is essential. If deep insertion is mistakenly shallow, one fails to reach Ying and harms Wei; if shallow insertion is mistakenly deep, one over-punishes and damages Ying.
7. Seasonal Timing: Human body and seasons are closely linked. Acupuncture must adapt to seasonal changes. *Suwen·Diagnosis Essentials and Final Principles* says: "Spring, summer, autumn, winter each have their rules." Depth must consider both condition and season. *Lingshu·Fundamentals and Transmission* states: "In spring, select collateral vessels, Luo points, major meridians, and muscle spaces—deep for severe cases, shallow for mild. In summer, select all transport points, fine collaterals, muscles, skin. In autumn, select union points, follow spring method. In winter, select well points and transport points—deep and leave long." Generally, shallow insertion in spring/summer, deep in autumn/winter—based on *Nanjing*'s principle: "In spring/summer, yang qi ascends, human qi rises too—shallow insertion needed. In autumn/winter, yang qi descends, human qi sinks—deep insertion required." Ignoring seasonal patterns risks "great disorder," as *Suwen·Four Seasons and Reversed Needling* warns: "All four seasons' needling must follow natural order. Disregarding it causes chaotic qi and disease."