1.Lumbar and sacral pain, atrophy and numbness of the lower limbs; 2. Irregular menstruation, leukorrhea, and other gynecological conditions; 3. Nocturnal emission, impotence, and other andrological conditions.

In the waist area, on the posterior midline, in the depression below the spinous process of the 4th lumbar vertebra.

Step 1: Sit upright or lie prone.
Step 2: Identify the high points of the iliac crests.
Step 3: The intersection of the midpoint of the line connecting the two iliac crests with the posterior midline is the spinous process of the 4th lumbar vertebra.
Step 4: There is a depression below the spinous process of the 4th lumbar vertebra, which is the location of this acupoint.