Diarrhea, dysentery, hernia, lumbosacral pain, sciatica, etc.

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

Lie prone. Starting from the highest point of the iliac crest at the back of the pelvis, palpate inward and downward along the sacral horns on both sides to feel a prominent bony protrusion (the posterior superior iliac spine). The midpoint of the iliac crest at the same level is the spinous process of the 1st sacral vertebra. Push down two vertebrae to reach the 3rd sacral vertebra. Measure two horizontal fingers lateral 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, which is the location of this acupoint.