Why does my back hurt in the morning?

Why does my back hurt in the morning? Usually for ordinary reasons: a spine that has been still for hours, a mattress or sleeping position that doesn’t suit you, or a bad night’s sleep. Back pain is very common and most of it is not a sign of anything serious (NHS). One morning pattern is different, though. Long stiffness on waking, pain that wakes you in the second half of the night and back pain that eases with movement but not with rest, starting before your mid-40s, can point to inflammatory back pain, and that needs a doctor’s assessment.

What happens to your spine overnight?

The intervertebral discs between your vertebrae are partly water. Through the day, standing and sitting squeeze some of it out. Lying down lets the discs take it back.

In a small MRI study, eight healthy men were scanned twice: once after six hours lying down, and once after four hours standing and three hours sitting. Over that simulated day, the lower three lumbar discs lost on average about 16% of their volume, mostly as lost height (Botsford et al., 1994).

The overnight refill makes the spine stiffer first thing. When 21 volunteers were measured, their lower backs bent forward about 5 degrees further in the afternoon than in the early morning. Combining that with lab tests on donor spines, the researchers estimated that bending forward puts about 300% more stress on the lumbar discs in the early morning than later in the day, and about 80% more on the ligaments (Adams et al., 1987).

So some stiffness first thing is partly how discs behave, not a sign of damage.

Does early-morning bending matter?

One trial built on that idea. After six months of pain diaries, 85 people with persistent or recurring low back pain were split into two groups. One was taught to limit bending forward in the lower back early in the morning. The other did exercises chosen because they were not expected to help. Pain fell in the taught group, by an estimated third, but not in the comparison group, which improved in a similar way once it was taught the same thing six months later (Snook et al., 1998). It is one trial from the 1990s with diary outcomes, so treat it as a lead rather than settled advice.

Is your mattress causing morning back pain?

It can be part of it, and the best evidence points away from very firm beds.

The best-known trial took 313 adults with long-term non-specific low back pain who had pain while lying in bed and on getting up. They were randomly given either a firm or a medium-firm mattress, and neither they nor the assessors knew which. After 90 days, the medium-firm group were about twice as likely to have improved in pain while lying in bed and in disability. For pain on getting up, the 90-day difference was borderline, but across the whole study the medium-firm group had less pain on rising (Kovacs et al., 2003).

A review of 39 studies reached the same view: medium-firm mattresses went with better comfort, sleep quality and spinal alignment (Caggiari et al., 2021).

What about replacing an old bed? In one study, 59 healthy adults with minor back discomfort rated their sleep and back every morning for four weeks in their own beds, which averaged 9.5 years old, then for four weeks on new medium-firm beds. Sleep improved and back discomfort fell (Jacobson et al., 2009). There was no comparison group, and people knew they had a new bed, so expectation may explain part of it.

So “firmer is better” is not proven, and most mattress studies are too small and short to tell you which mattress suits your body. If your back hurts all day, not just in bed, the bed is unlikely to be the whole story.

For pillows and positions, see our guide to sleeping position and pillows, and for the neck, stiff neck after sleeping.

Does sleeping position cause back pain in the morning?

A scoping review screened 4,186 articles and found only four that looked at sleep posture and spinal symptoms. Waking pain and stiffness were the symptoms most often studied, and lying on your side was generally linked to fewer of them. The authors said there were not enough high-quality studies to answer the question (Cary et al., 2019).

A follow-up study filmed 53 adults asleep at home for two nights. People who woke with neck symptoms spent more time in twisted, unsupported positions than people without symptoms. The 20 people who woke with low back symptoms did not differ significantly from the symptom-free group in how often they changed position or how long they spent in those positions. Both symptomatic groups did report worse sleep (Cary et al., 2021).

So for the lower back, no position has good evidence behind it. If one way of lying reliably leaves you stiff, trying another is reasonable.

Can poor sleep make your back hurt?

Sleep and back pain are linked, and in at least one long study, worse sleep came first.

In a study that followed 2,131 working adults for an average of 3.7 years, people whose insomnia symptoms got worse were 1.4 times more likely to develop back pain later, after allowing for health, lifestyle and body measurements. The researchers found no sign of the reverse, back pain leading to worse insomnia (Agmon & Armon, 2014).

For people who already have low back pain, a review of 14 studies with 19,170 participants found that poor sleep at the start was linked to a lower chance of the pain improving in the longer term. The evidence was rated low to very low quality, and 13 of the 14 studies were at high risk of bias (Silva et al., 2024).

Both are observational, so they show links, not causes. But if your back is worse after broken nights, sleep deserves attention in its own right. Stress plays into both, which we look at in Can stress cause back pain?

When is morning back pain a red flag?

The pattern doctors watch for is inflammatory back pain, the kind caused by ankylosing spondylitis and related conditions. The NHS describes it as back pain and stiffness that are worse in the morning and at night, that get better with exercise but not with rest, and that may wake you regularly, often with pain around the buttocks. It usually starts between the ages of 18 and 40 (NHS).

NICE notes that these conditions are often mistaken for ordinary mechanical back pain, which delays treatment. Its guideline says that a person whose low back pain started before 45 and has lasted more than three months should be referred to a rheumatologist if four or more of these are also present (NICE NG65):

• the back pain started before the age of 35
• waking in the second half of the night because of symptoms
• buttock pain
• improvement with movement
• improvement within 48 hours of taking anti-inflammatory painkillers (NSAIDs)
• a parent, brother, sister or child with spondyloarthritis
• arthritis, now or in the past
• inflammation where a tendon or ligament attaches to bone (enthesitis), now or in the past
• psoriasis, now or in the past

With exactly three, NICE advises a blood test for the HLA-B27 gene first. The guideline also points out that axial spondyloarthritis affects a similar number of women as men.

Is morning stiffness on its own a warning sign?

Not by itself. In a study of 213 people under 50 with chronic back pain, morning stiffness lasting more than 30 minutes helped tell ankylosing spondylitis from mechanical back pain, but no single feature separated the two well enough. Combinations did better: two or more of long morning stiffness, improvement with exercise but not rest, waking in the second half of the night and buttock pain that alternates sides picked up about 70% of the people with ankylosing spondylitis (Rudwaleit et al., 2006).

So if your stiffness is long, keeps returning over months and fits several items on the NICE list, tell your GP about the pattern, not just the pain. The list is a reason to get checked, not a way to diagnose yourself.

What helps when your back is stiff in the morning?

The NHS advises staying active and carrying on with daily activities, not staying in bed for long periods, and suggests a heat pack wrapped in a tea towel for joint stiffness or muscle spasms (NHS). There is more on that in Heat or ice for back pain?

For acute low back pain, two trials with 401 people found small improvements in pain and function with advice to stay active rather than rest in bed (Dahm et al., 2010). For long-term low back pain, a Cochrane review of 249 trials found moderate-certainty evidence that exercise reduces pain compared with no treatment or usual care (Hayden et al., 2021).

Gentle movement suits the first minutes of the day. Our pages on the cat-cow stretch and lower back stretches explain what each is for and how it should feel, and stretches before bed covers the other end of the day.

The day before counts too. See lower back pain from sitting for the evidence on long desk days, and Is walking good for back pain? for one of the simplest ways to move more.

When to see a doctor

The NHS advises seeing a GP if you have back pain and (NHS):

• it does not improve after treating it at home for a few weeks
• it stops you doing your day-to-day activities, or you are worried or struggling to cope
• you have lost weight without trying, or there is a lump or swelling in your back, or its shape has changed
• it does not improve after resting or is worse at night
• it is worse when sneezing, coughing or going to the toilet
• it comes from the top of your back, between the shoulders

Ask for an urgent GP appointment or contact 111 if you feel hot, cold, shivery or generally unwell, or if the pain is severe and started suddenly or is getting worse quickly.

Call 999 or go to A&E if back pain comes with pain, tingling, weakness or numbness in both legs, loss of feeling around the genitals or bottom, changes in bladder or bowel control, changes in sexual function, chest pain, or if it started after a serious accident. These are the red flags that should never wait.

If your morning back pain matches the inflammatory pattern above, say so to your GP even if none of these apply. For how ordinary back pain tends to settle, see Will back pain go away on its own?

So, why does my back hurt in the morning?

• Most often, stiffness after a night lying still. Discs take up fluid overnight and the spine is stiffer first thing.
• Your bed may play a part. Medium-firm has the best evidence; very firm is not better.
• Poor sleep and back pain are linked, and worse sleep can come first.
• Long morning stiffness that has lasted months, started young and eases with movement is the pattern to get checked.

Bavelu’s Spine Wake-Up session is a short morning routine for the back, designed and filmed by physiotherapists, and it can be done on a mat with no equipment.