When the spasm is coming from a joint at the back of the spine
A sharp local catch on arching, twisting or standing up, with pain that stays close to the spine.
Each vertebra connects to the ones above and below at two small joints at the back of the spine, the facet joints. They're proper synovial joints with a capsule and a very rich nerve supply, and they guide how much your spine can bend, arch and rotate.
Because they're so well innervated, they're quick to complain and quick to recruit the muscles around them.
Why a joint irritation locks a whole segment
A facet joint under strain sends a dense, immediate signal into the spinal cord. The reflex answer is to splint the segment — contract everything that crosses it so the joint can't be loaded any further. It's a fast, aggressive response, which is why facet-related episodes often arrive as an instant catch rather than a slow build.
People describe standing up from a chair, reaching backwards for a seatbelt, or turning to look behind them and simply being stopped mid-movement.
What it usually feels like
- Pain close to the spine, often one-sided, sometimes referring into the buttock or upper thigh but rarely below the knee
- Worse arching backwards, worse twisting towards the painful side
- Worse standing for long periods, often eased by sitting or leaning forward
- Stiff and sore first thing in the morning, loosening over twenty or thirty minutes
- A sense that there's one specific movement you can't do, rather than general pain
Disc pain typically hates forward bending and sitting. Facet pain typically hates extension and rotation. Neither rule is absolute, but the contrast is a useful starting point.
During the acute phase
Follow the immediate steps. Then:
Flexion usually settles it. Lying on your back with knees up towards the chest, or on your side curled, tends to open the joints and take the load off. Standing tall and arching is the position to avoid.
Heat works particularly well here because so much of what you're feeling is the muscular splinting rather than the joint itself.
Avoid the twist test. Rotating to see how far you can go before it catches is the single most reliable way to re-provoke a facet episode.
What tends to make it worse
- Arching backwards, overhead work, painting a ceiling
- Repeated rotation — golf swings, reversing a car, racquet sports
- Long periods standing on a hard floor
- Sleeping face down with the head turned
Get assessed if
The usual warning signs come first.
Beyond those: if episodes are becoming more frequent or lasting longer, if the pain is becoming constant rather than movement-triggered, or if you're losing the ability to arch or rotate at all. Facet-related pain responds well to manual therapy and to targeted strength work, so it's worth getting properly assessed rather than riding out four episodes a year.
Get the emergency protocol before the next one
The full 21-page guide: what to do in the first 48 hours, the day-by-day recovery, and how to come back without re-triggering it. Free.
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Other patterns
- Sciatica and nerve irritation Pain that travels into the buttock or down the leg, with the low back locking to protect the nerve root.
- Disc bulge or herniation Pain that spikes with bending, sitting and coughing, and a back that locks the moment you move the wrong way.
- Spinal stenosis Legs that ache or go heavy when you stand and walk, and ease the moment you sit or lean forward.
- SI joint irritation Pain in one dimple of the low back or deep in the buttock, worse on stairs, standing on one leg, and rolling over in bed.
- Overload, fatigue and stress The episode with no dramatic cause — a sneeze, a sock, the third bad night of sleep in a stressful month.