Back Pain: Diagnosis, Treatment and Recovery

How the back works and what goes wrong

The spine is a stack of 33 vertebrae separated by shock-absorbing discs, linked by small facet joints and supported by ligaments and layers of muscle. Nerve roots leave the spinal canal between each pair of vertebrae. Pain can come from any of these structures, and also from how the nervous system processes pain signals. Once pain lasts for months, the nervous system can become sensitized, so pain persists even after tissues have healed. This is why chronic back pain is treated differently from a fresh strain.

Types of back pain

Doctors also classify back pain by time: acute (less than 6 weeks), subacute (6 to 12 weeks) and chronic (more than 12 weeks). Chronic back pain needs a broader approach.

Spinal conditions that cause back pain

• Muscle and ligament strain: the most common cause of acute pain.
• Degenerative disc disease: age-related disc wear. Disc changes on MRI are found in many people without pain, so they are not always the cause.
• Herniated disc: the soft center pushes through the disc wall and may irritate a nerve root, causing sciatica.
• Facet joint arthritis and spondylosis: wear and tear arthritis of the spine.
• Spinal stenosis: narrowing of the spinal canal, mostly over age 60, causing leg pain on walking.
• Spondylolysis and spondylolisthesis: a stress fracture or forward slip of a vertebra.
• Osteoporosis with compression fractures: sudden pain and loss of height in older adults.
• Axial spondyloarthritis, including ankylosing spondylitis: inflammatory back pain in young adults.
• Scoliosis and kyphosis: curvature of the spine, painful mainly in adults.
• Sacroiliac joint dysfunction: pain over the dimples at the base of the spine.
• Serious but rare: spinal infection, tumors and cauda equina syndrome.

Risk factors

• Age 30 to 60
• Physically heavy or very sedentary work
• Smoking, which affects disc nutrition
• Obesity
• Low fitness and weak core muscles
• Previous back pain, the strongest predictor of future pain
• Depression, anxiety, job dissatisfaction and fear of movement, which predict pain becoming chronic

How doctors diagnose back pain

History and examination

Your doctor will ask about the onset, location and pattern of pain, leg symptoms, and red flags such as fever, weight loss, cancer history, trauma, steroid use and bladder or bowel symptoms. The examination covers posture, movement, tenderness, straight leg raise and neurological tests (strength, reflexes and sensation).

When imaging helps

Guidelines from the American College of Physicians and NICE advise against routine X-rays or MRI for back pain without red flags, because findings such as disc bulges are common in people without pain and can lead to unnecessary procedures. Imaging is used when:

• red flags suggest fracture, infection, cancer or cauda equina syndrome
• nerve symptoms are severe or progressive
• pain persists despite treatment and surgery or injection is being considered

Blood tests (ESR, CRP, blood count) are used if infection, inflammation or cancer is suspected.

Back pain treatment: what works

Acute back pain (under 6 weeks)

• Reassurance and staying active: the most effective single measure.
• Superficial heat reduces pain and disability in the first weeks.
• NSAIDs such as ibuprofen or naproxen, at the lowest effective dose for the shortest time. Avoid if you have ulcers, kidney disease, heart failure or take blood thinners.
• Massage, spinal manipulation and acupuncture may give modest short-term relief.
• Muscle relaxants may be prescribed for a few days but cause drowsiness.
• Opioids are generally avoided because of limited benefit and risks of dependence.

Chronic back pain (over 12 weeks)

• Exercise therapy of any type that you will keep doing: walking, Pilates, yoga, tai chi, strengthening.
• Physical therapy combining exercise, education and graded return to activity.
• Psychological therapies, especially cognitive behavioral therapy and pain reprocessing, reduce pain and disability.
• Multidisciplinary rehabilitation for people with major work loss or disability.
• Medicines: NSAIDs in flares; duloxetine may be considered. Long-term opioids are not recommended.
• Radiofrequency denervation for selected people with facet joint pain confirmed by a diagnostic block.

Back pain with sciatica

Most sciatica improves within 6 to 12 weeks. Epidural steroid injections can help severe acute nerve root pain. Surgery (discectomy) is considered for persistent severe sciatica with a matching disc herniation, or progressive weakness. It speeds recovery but long-term results are similar to non-surgical care for many people.

Surgery

Spinal surgery is needed by only a small minority: for cauda equina syndrome, progressive neurological deficits, unstable fractures, infection, tumors, spinal stenosis that limits walking despite treatment, and selected cases of spondylolisthesis. Spinal fusion for nonspecific chronic back pain has limited benefit.

Complications

• Chronic pain and disability
• Loss of work and income
• Depression, anxiety and poor sleep
• Deconditioning from avoiding activity
• Medicine side effects, including opioid dependence

Outlook and recovery

Most people with acute back pain improve markedly within 2 weeks, and the majority are much better within 6 weeks. Around 1 in 3 have a recurrence within a year, and a smaller proportion develop chronic pain. Early return to activity, regular exercise and addressing fear of movement are the best ways to recover fully and prevent recurrence.

Prevention

• Exercise regularly, including core and hip strengthening.
• Maintain a healthy weight and stop smoking.
• Lift with your legs, keep loads close and avoid twisting while lifting.
• Break up long periods of sitting every 30 to 45 minutes.
• Set up your workstation so the screen is at eye level and your feet are flat.

For a symptom-focused view of what different types of back pain may mean, see back pain causes by location.

Frequently asked questions

What is the best treatment for back pain?

For most people, the best treatment is to stay active, use heat, take short-term anti-inflammatory pain relief if safe, and start a regular exercise program. For long-lasting pain, physical therapy and psychological approaches such as CBT have the strongest evidence. Surgery helps only specific problems.

How long does back pain last?

Acute back pain usually improves a lot within 2 weeks and settles within 6 weeks. Pain that lasts 6 to 12 weeks is subacute, and beyond 12 weeks it is chronic. Recurrences are common, so continuing exercise after recovery is important.

Do I need an MRI for back pain?

Usually not. Guidelines advise against early MRI for back pain without red flags, because it rarely changes treatment and often shows age-related changes that are not causing pain. An MRI is useful for suspected serious disease, severe or worsening nerve symptoms, or before injections or surgery.

Is back pain a sign of something serious?

Rarely. Fewer than 1 in 20 cases are due to a serious condition such as a fracture, infection, cancer or cauda equina syndrome. Warning signs include fever, weight loss, cancer history, night pain, leg weakness, groin numbness and bladder or bowel problems.

Can a chiropractor help back pain?

Spinal manipulation by a chiropractor, osteopath or physical therapist can give modest short-term relief, similar to other recommended treatments. It works best as part of a plan that includes exercise. It is not suitable for people with osteoporosis, spinal cord compression or other red flags.