Bladder 31 (BL31) – Posterior sacral foramen 1
Location
Bl31 is located in the first posterior sacral foramen, about one thumb's width lateral to the midline of the sacrum.
Functions
Bl31 can help release tension in the back and improve pelvic mobility. It is also used for issues in the hindquarters.
Indicators
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Safety
This point should be treated with care, as it is close to sensitive nerve structures. Only experienced therapists should apply it.
Medical information
Bl31 is located in the first posterior sacral foramen, at the level of the sacral base, lateral to the median line. Palpation is performed along the dorsal sacral foramina.
Bl31 is used to treat lumbosacral issues, sciatica, hindquarter dysfunction, and to support pelvic mobility. It affects local nerve branches and can promote blood circulation.
When needling Bl31, special care must be taken to avoid irritation of the sacral nerve and surrounding structures. Avoid deep needling if localization is uncertain.
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