The exact location of the Ren Yu acupoint is in the spinal region, below the spinous process of the 2nd lumbar vertebra, 1.5 inches off the posterior midline.
Kidney Yu belongs to the foot solar bladder meridian. It is mainly used for treating dizziness, tinnitus, deafness, lumbago, enuresis, spermatorrhea, impotence, premature ejaculation, infertility, menstrual disorders, subluxation of the belt, infertility, and thirst.
In modern times, it is often used to treat nephritis, renal colic, renal prolapse, enuresis, urinary tract infection, impotence, premature ejaculation, spermatorrhea, lumbago, edema, hepatomegaly, menstrual disorders, gastric hemorrhage, intestinal hemorrhage, hemorrhoids, asthma, deafness, anemia, lumbar soft-tissue injuries, intercostal neuralgia, and hemiplegia (inability of one side of the limbs to move at will), and so on.
If needling of Kidney Yu is needed, it needs to be operated by a professional doctor.