Lower back and sciatica

Back spasm and sudden back pain: 'my back has gone'

Written by Lance Peterson, GOsC-registered osteopath · Last reviewed October 2026

What a back spasm is, why it often follows an ordinary movement, what the NHS advises, and which symptoms mean you should not wait it out.

A sudden, sharp tightening of the muscles in the lower back can make it hard to stand upright, walk or even get out of a chair. It often follows something ordinary, such as bending to pick something up, a sneeze or a long day in the garden. It feels alarming, but the NHS says back pain usually improves within a few weeks, and most people recover without needing a scan.

When to get urgent help

Call 999 or go to A&E straight away if you have back pain together with any of these. They can be signs of a rare but serious condition such as cauda equina syndrome. Do not drive yourself.

Numbness or tingling around your genitals, buttocks or inner thighs (the saddle area)
Difficulty passing urine, loss of bladder or bowel control, or being unable to feel when you are passing urine or stool
Pain, tingling, weakness or numbness in both legs, or sciatica on both sides, or weakness in a leg that is getting worse
New changes to sexual sensation or function alongside back or leg pain
Chest pain, or back pain that started after a serious accident such as a car crash

What it can feel like

A sudden sharp pain or catch in the lower back, often with tight, hard-feeling muscles either side of the spine
Difficulty standing up straight, bending or turning
Pain that is worse with certain movements and eases in other positions
Pain that may spread into the buttock, but not usually below the knee

Common contributors

Straining the muscles or ligaments, often after lifting, twisting or an unaccustomed activity
Irritation of the small joints of the spine, which can make nearby muscles tighten protectively
Stress, poor sleep and a recent spell of inactivity can make the back more sensitive
Often a clear trigger cannot be found

General self-care

These are general comfort measures many people find reasonable. They are not a treatment plan, and what suits one person may not suit another.

Keep moving as comfortably as you can. The NHS advises staying active and carrying on with your daily activities, and not staying in bed for long periods
Try different positions to find what is comfortable, and change position often
The NHS says either an ice pack or a heat pack wrapped in a tea towel can be used. Use whichever feels better and protect your skin
Walk a little more each day as it settles, and return to normal activity and exercise gradually
If you use over-the-counter painkillers, follow the packet instructions and ask a pharmacist if you are unsure what is suitable. The NHS says paracetamol on its own is not recommended for back pain

When to see your GP

See your GP promptly, or call NHS 111, if you have any of the following:

Feeling hot, cold, shivery or generally unwell, or severe pain that starts suddenly or quickly gets worse
Unexplained weight loss, or a lump, swelling or change in the shape of your back
Pain that is worse at night or does not ease with rest, or is worse when you cough, sneeze or open your bowels
A history of cancer and new, persistent back pain

Consider seeing your GP if:

Your pain has not improved after a few weeks of home care
The pain stops you doing your daily activities, or you are struggling to cope
The pain started after a fall, accident or blow, or you have a lump, swelling or change in the shape of your back
The pain is worse at night, does not ease with rest, or is worse when you cough, sneeze or open your bowels

How osteopathy may help

Osteopaths regularly see people with sudden back muscle spasm and lower back pain. After taking a full history and examining you, treatment typically combines hands-on techniques (such as soft-tissue work, joint mobilisation and, where suitable, manipulation) with advice and exercises you can do yourself. For some people this may help ease pain and stiffness and make movement more comfortable.

NICE guidance for low back pain says manual therapy (spinal manipulation, mobilisation or soft-tissue techniques) can be considered, but only as part of a treatment package that includes exercise. A 2026 Cochrane review found that spinal manipulation may give a small improvement in chronic low back pain compared with sham treatment and similar results to other conservative treatments, but the certainty of that evidence is low to very low.

Results vary from person to person, some people feel a little sore for a day or two afterwards, and osteopathic care is not right for everyone. It sits alongside, not instead of, medical care, and staying active and doing your exercises remain central.

If you would like your symptoms assessed, you are welcome to book an appointment. Osteopathic care is not right for everyone, and if something needs medical attention first, I will tell you.

Book an appointment

Common questions

What should I do when my back goes into spasm?

The NHS advises staying active and carrying on with your daily activities as far as you can, changing position often, and not staying in bed for long periods. It says either heat or ice can be used, and that back pain usually improves within a few weeks.

Do I need a scan or X-ray for a sudden back spasm?

NICE guidance says imaging should not be routinely offered for low back pain in non-specialist settings. Scans often show changes that are also common in people with no pain and rarely change what is done for ordinary back pain.

How long does a back spasm last?

Most back pain, including spasm after a strain, improves within a few weeks according to the NHS, although it can sometimes last longer or come back. If it has not improved after a few weeks of home care, see your GP.

Free 5-minute exercise sheet

A simple, printable sheet of gentle exercises and stretches, about five minutes a day, based on NHS physiotherapy leaflets. It is general information, not a personal treatment plan, and it is not suitable if you have any of the urgent signs listed above.

Download the exercise sheet (PDF)

Sources and further reading

Links open in a new tab. Sources were checked in October 2026.

Related guides

This page is general information to help you understand common aches and pains. It is not medical advice and cannot diagnose your problem. If you are worried about your symptoms, please speak to your GP or call NHS 111.