US Medical Term · anatomy
Sacrum
Sacro
In 9 languages
| Language | Term |
|---|---|
| English | Sacrum |
| Spanish (Español) | Sacro |
| Chinese (中文) | 薦骨 |
| Korean (한국어) | 천골 |
| Vietnamese (Tiếng Việt) | Xương cùng |
| Filipino (Tagalog) | Sakrum |
| Portuguese (Português) | Sacro |
| Thai (ภาษาไทย) | กระดูกกระเบนเหน็บ |
| Japanese (日本語) | 仙骨 |
What it means
The sacrum is a large, triangular bone at the very base of your spine. It sits between the two hip bones and forms the back wall of the pelvis. The sacrum is actually made up of five vertebrae that fuse together during childhood. It connects the spine to the pelvis and helps distribute the weight of your upper body. At its lower end, it attaches to the tailbone (coccyx). The joints where the sacrum meets the hip bones are called the sacroiliac joints, which can be a source of lower back pain. Fractures of the sacrum can occur from falls or high-impact injuries.
How to say it
Sentences a patient might use with a doctor, nurse, pharmacist, or insurer:
I have pain at the very base of my spine where the sacrum is.
Tengo dolor en la base de la columna vertebral donde está el sacro.
My doctor mentioned sacroiliac joint pain — is that related to the sacrum?
Mi médico mencionó dolor en la articulación sacroilíaca — ¿está relacionado con el sacro?
Could my lower back pain be coming from the sacrum?
¿El dolor en la parte baja de la espalda podría venir del sacro?
Where you'll see it
Related terms
Sources
Last reviewed: September 2026