Waking up with a stiff lower back that loosens off once you get moving is common and usually not serious. What matters is how long it lasts — and whether it behaves like ordinary stiffness or like something else.
The short version
- Lying still for hours lets everything stiffen, so the first movements of the day feel tight.
- Stiffness that eases within minutes is very different from stiffness lasting over half an hour every morning.
- A short walk in the first half hour tends to loosen a stiff back faster than any stretch.
- Morning stiffness over 30 minutes, pain that's better with movement but not rest, night waking, and a start before 45 is a pattern worth taking to a GP — it's assessed differently.
Why mornings are the worst
Your back doesn't move for six or eight hours while you sleep. Muscles and joints get stiffer when they stay still, and the first stretch of the morning is when you notice it. That's why the stiffness usually fades within a few minutes of walking about, making a coffee, and getting on with your day.
Beds play a part too, though probably less than people think. A large trial comparing firm mattresses with medium-firm ones in people with long-term low back pain found that the medium-firm group did better for pain in bed, pain on getting up, and day-to-day function. That's worth knowing if your mattress is very firm or completely worn out, but a new mattress on its own is rarely the whole answer.
For most people that's the whole story: an ordinary, mechanical stiffness that eases with movement. If that's you, skip to the morning routine below. The next section is for the smaller group whose mornings behave differently.
When morning stiffness is a different kind of problem
Some back pain is driven by inflammation rather than by everyday wear and load. It behaves in a way that's recognisably different, and it's worth knowing the pattern — not to worry about, but because it's assessed and treated down a different route.
The tell-tale combination is:
- Morning stiffness lasting 30 minutes or more, most mornings, for weeks or months — not a few minutes.
- Pain that gets better with movement and worse with rest. This is the one that catches people out. Ordinary back pain usually eases when you rest it. This kind doesn't — sitting still makes it worse.
- Waking in the second half of the night because of the pain, often needing to get up and move around.
- A slow, gradual start rather than a sudden tweak, and often pain in the buttocks rather than only the lower back.
- Starting young. The NHS notes that ankylosing spondylitis usually first develops between the ages of 18 and 40.
That pattern is called inflammatory back pain, and the condition behind it is axial spondyloarthritis — usually shortened to axial SpA or axSpA. It's a long-term condition where inflammation affects the spine and the sacroiliac joints, which are the joints connecting the base of your spine to your pelvis. Ankylosing spondylitis is the best-known form of it, and the name you're more likely to have heard.
Why does spotting it matter? Because it's routinely missed. The National Axial Spondyloarthritis Society puts the average delay between symptoms starting and a diagnosis in the UK at around 8.5 years — largely because inflammatory back pain gets treated as ordinary back pain for years. Getting it recognised earlier means getting onto the right route sooner, and that route is different: it's led by a rheumatologist, and it may involve blood tests, scans and medication alongside exercise.
One important caveat before you read the next bit. This is a pattern to describe to a doctor, not a checklist to diagnose yourself with. Plenty of people tick one or two of these boxes and have entirely ordinary back pain. It's the whole combination, persisting over months, that's the signal.
What a GP is looking for
It helps to know how the decision is actually made, because it tells you what's worth mentioning. NICE guidance on spondyloarthritis (NG65) says that if low back pain started before the age of 45 and has lasted longer than three months, a GP should refer you to a rheumatologist if four or more of these are also present:
- Symptoms started before the age of 35
- Waking during the second half of the night because of symptoms
- Pain that improves with movement
- Buttock pain
- Pain that improves with anti-inflammatory painkillers, often within 48 hours
- A close relative — parent, brother, sister or child — with spondyloarthritis
- Current or past psoriasis
- Inflammatory arthritis, or tendon or joint pain and swelling that wasn't caused by an injury
If exactly three are present, the guidance is to do an HLA-B27 blood test first, and refer if it comes back positive. So if this sounds like you, the useful thing to do is write down which of these apply and take that list to your GP appointment. It turns a vague "my back hurts in the mornings" into the specific information they need.
⚠️ When to see a doctor in person
Go to A&E the same day if you have numbness around your groin, bottom, or inner thighs, trouble passing urine or controlling your bowels, or weakness in both legs. These are rare but need seeing urgently.
- Book an appointment if you've had a fall or accident, or you have a fever or unplanned weight loss
- Book an appointment if you have a history of cancer or a weakened immune system
- Book an appointment if the pain isn't improving after a few weeks
- Worth booking specifically about: morning stiffness lasting 30 minutes or more for weeks, pain better with movement but not rest, night waking, buttock pain, or a start before age 45 lasting over three months — mention that combination directly
Gentle ways to start the morning
This part is the same either way. The main message from back-pain guidelines is simple: keep moving. NICE guidance for low back pain recommends staying active and using exercise as a core part of managing it — and movement is, if anything, even more central when the pain is the inflammatory kind, since that's the sort that eases with activity.
Lie on your back, knees bent, feet flat. Let both knees roll slowly to one side, then the other. Keep it small and easy — don't force it.
Lying on your back, bring one knee gently towards your chest, hold for 5 seconds, then swap.
On hands and knees, slowly arch your back up, then let it sag down. Move at breathing pace, not fast.
On your feet within the first half hour of waking. This tends to loosen a stiff back faster than any stretch does.
Move within a range that feels okay. Stiffness easing as you go is a good sign. Sharp or spreading pain means stop and get advice.
Progression note
Do the routine most mornings for two to three weeks before judging it — our cat-camel guide has the form cues in full. Once it's easy, add a little more walking rather than more stretching. The aim is to get your back used to normal movement again, not to become very flexible. Regular activity across the day helps more than one big effort in the morning.
And if three weeks of this hasn't touched it, and the pattern above sounds familiar, that's your cue to book the appointment rather than to try harder.
The bottom line
A stiff lower back in the morning that loosens within minutes is common and usually not worrying — gentle movement and a short walk beat lying still, and if you're wondering whether exercise is safe at all right now, we've covered that question separately. But stiffness that lasts over half an hour most mornings, wakes you in the night, eases with movement but not with rest, and started before you were 45 is a different pattern with a different route. That one's worth an appointment and a specific conversation. Our back pain guide covers the wider picture.