Understand your condition
Sacroiliitis
Inflammation where the sacrum meets the pelvis may cause buttock or lower-back pain.

What to know
- ✓Pelvis illustrations compare the sacroiliac joints with inflammation highlighted at one sacroiliac joint.
- ✓A clinical evaluation connects symptoms with examination findings and imaging when appropriate.
Information, not a diagnosis.
Your symptoms deserve an individual evaluation. If pain is severe, worsening, or accompanied by new weakness, seek medical care.