1.Musculoskeletal system diseases: Lumbar pain, sacroiliac joint inflammation, spasm of the sacrospinalis muscle;
2.Digestive system diseases: Enteritis, dysentery, constipation, pediatric indigestion;
3.Surgical system diseases: Appendicitis, intestinal bleeding;
4.Nervous system and mental disorders: Sciatica;
5.Urological and reproductive system diseases: Enuresis, nephritis, gonorrhea.

On the waist, below the spinous process of the 4th lumbar vertebra, 1.5 cun lateral to the midline. (This acupoint is bilateral, one on each side.)

Step 1: Sit up straight or lie prone;
Step 2: The intersection of the line connecting the highest points of the pelvis (the highest points of the iliac crest) with the posterior median line is the spinous process of the 4th lumbar vertebra;
Step 3: There is a depression below the spinous process of the 4th lumbar vertebra, and 2 horizontal fingers lateral to this depression (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) is the location of this acupoint.