Why your back pain keeps coming back

If your back has gone three or four times over the last few years, the conclusion most people reach is that something in there is broken and keeps giving way. That is usually not what is happening.

Recurrence is the pattern, not the exception

Low back pain is one of the most common conditions in the world and it is characteristically episodic. Getting a second episode is not evidence of a failed recovery or a structural fault. It is the normal course of the condition. What varies — and what you can influence — is how often episodes come and how long each one lasts.

The gap that causes most recurrences

Here is the sequence we see over and over. Your back goes. You get treatment. Within two or three weeks the pain has largely settled, you feel fine, and you stop.

The trouble is that pain settles well before capacity returns. During a painful episode you move less, and the muscles that support the spine lose strength and endurance quickly. Stopping at the point where it stops hurting means going back to work, to lifting, to cricket, to picking up a grandchild, with a back that is measurably weaker than it was before the episode. The next flare is then a matter of time.

Finishing the job means continuing for several weeks past the point where you feel better. That single change does more to prevent recurrence than anything else on this page.

What the scan does and does not tell you

Disc bulges, disc degeneration and facet joint changes are extremely common in people who have never had back pain, and they become more common with every decade of life. They show up on the scans of people playing sport and lifting weights without complaint.

This does not mean scans are useless. It means a finding on a scan is only meaningful when it lines up with your symptoms and your examination. Being told you have "the spine of a seventy-year-old" when you are forty-five is one of the more damaging things that happens in this field, because people then stop doing the exact things that would help.

What actually predicts the next episode

The strongest predictors are unglamorous:

• Having had one before. The best predictor of an episode is a previous episode, which is why finishing rehabilitation matters.
• How much you move. Not exercise specifically — total daily activity.
• Sleep. Poor sleep lowers pain thresholds measurably. Several bad nights in a row is a genuine risk factor.
• Stress and workload. Both the psychological kind and the physical kind.
• Confidence. People who believe their back is fragile move less, and moving less is the mechanism.

Posture, which gets almost all of the attention, predicts remarkably little. Holding any position for hours without changing it matters far more than which position it is.

What to do during a flare

Keep moving within what you can tolerate. Stay at work in some form if you possibly can — people who stay in work recover faster. Use pain relief so you can move rather than to allow you to stay still. Avoid bed rest beyond a day. Expect the sharp phase to ease over days to a couple of weeks.

What to do between flares

Build tolerance. Strength work for the back, hips and legs, loaded progressively over months rather than weeks. Regular walking. Enough sleep to matter. And a deliberate return to the activities you have been avoiding, introduced gradually, because avoidance is what shrinks the range of things your back can handle.

When to get it checked

If pain travels down the leg past the knee, if there is progressive weakness, if it followed a significant fall, if you have unexplained weight loss or fever alongside it, or if it wakes you every night regardless of position — get assessed rather than working through it. And if you have had three or more episodes, that is the moment to treat the pattern rather than the current flare.