Vertically 0.7–1 cun. Or 1.5-2 cun through the foramen.
Caution:Reducing Needling techniques are contraindicated during pregnancy, except for promoting labor.
'Liao' means crevice, thus BL-31, BL-32, BL-33 and BL-34 are called 'Siliao'(Four crevices) or 'Baliao'(Eight crevice since there are four crevices on each side). They are called so, due to their location in the four sacral foramina.
Shangliao BL-31 (Upper crevice) is at the highest sacral foramina. Ciliao BL-32 (Second crevice) is at the second. Zhongliao BL-33 (Middle crevice) the third, while Xialiao BL-34 (Lower crevice) is the last one.
All these four points share similar actions, but Ciliao BL-32 is the most important one with the widest indication.
Shangliao BL-31 is comparatively less important. First of all, it regulates the Lower Burner and treats urination and defecation Difficulties. Kidney Deficiency is an important underlying pattern for this disorder, which is frequently seen in elderly and weak patients.
Furthermore, by removing Dampness from the Lower Burner, it is effective in treating gynecological disorders such as dysmenorrhoea, infertility, irregular menstruation, itching and pain of the genitals as well as white, red and white leukorrhea.
All these four points benefit the lumbar region, lower back and legs. They remove the Painful Obstructions from the Channel by invigorating the Qi and Blood. Ciliao BL-32 and Zhongliao BL-33 have the most effect on this action.