Jennifer | Mobility Protein's Substack

Jennifer | Mobility Protein's Substack

Is It Really Your Low Back? The Hidden Joint That Might Be Causing Your Pain

That deep ache near your tailbone isn’t always coming from your spine. Sometimes the solution is building stability, not stretching harder or pushing through the pain.

Jennifer | Mobility Protein's avatar
Jennifer | Mobility Protein
Jul 07, 2026
∙ Paid

Most people assume that every ache in their lower back is coming from their spine.

Sometimes they’re right.

But sometimes the real source of that deep, nagging pain sits just a little lower.

If you’ve ever felt an ache near your tailbone that shows up when you’re walking, bending over, carrying groceries, rolling over in bed, or standing on one leg, your sacroiliac (SI) joint may be contributing.

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