Nocturnal emission, hernia, leukorrhea, metrorrhagia, difficulty with urination and defecation, pain in the waist and hip, sciatica, lower limb paralysis, endometritis, spasms of the anal muscles, sequelae of infantile paralysis, lower limb paralysis, urinary retention, etc.

On the sacral region, 1.5 cun lateral to the median sacral crest, level with the fourth posterior sacral foramen. (This acupoint is bilateral, one on each side.)

Lie on your back. Starting from the highest point of the iliac crest at the back of the pelvis, feel inward and downward along the sacral horns on both sides to identify a prominent bony protrusion (the posterior superior iliac spine). At the same level as this protrusion, the central prominence of the iliac bone is the spinous process of the first sacral vertebra. From this vertebra, push down three vertebrae to reach the fourth sacral vertebra. Measure two horizontal fingers laterally from this vertebra (place the index and middle fingers side by side, using the width of the middle finger's proximal interphalangeal joint as the standard for 1.5 cun), and press where there is a sensation of soreness and swelling; this is the location of the acupoint.