Back Pain: A Complete Guide

Lower back pain is common throughout life.¹ It can be worrisome and limit your activities. In a small number of cases, a serious condition is the cause. Your symptoms, when they began, and the physical exam can help identify signs that require medical attention.² Pain and functional ability often improve over time, especially early in a new episode.³ This guide explains possible causes, what imaging results mean, and ways to resume your activities.⁴ Physical therapy can help you choose exercises and progress at a pace that suits your needs. Our comprehensive guide to physical therapy outlines this process. Our physical therapy guide for lower back pain explains the follow-up care.

What is low back pain and how is it classified?

Low back pain is pain located between the lower ribs and the buttocks; it is classified based on its cause and duration. A specific cause may be identified, or the pain may be classified as nonspecific following evaluation. The categories “acute,” “subacute,” and “chronic” describe its duration, as detailed below. Its intensity ranges from mild discomfort to severe pain. Back pain is a common reason for seeking medical care.¹

The lumbar region consists of five vertebrae, the bones of the spine. The discs between these bones distribute the load and allow for movement. Muscles move and support the back; ligaments connect the bones. Nerves transmit commands to the muscles and carry sensory information, among other things. This guide focuses on the lower back. Our guide on thoracic pain focuses on the upper back, where physical therapy for thoracic back pain adapts techniques to the mobility of the ribs.

Low back pain affects people in many countries and walks of life.⁵ In a 2000 review, between 11% and 84% of adults surveyed reported having experienced it at some point, depending on the studies and their methods.⁶ This variation explains why a single percentage cannot describe all populations. Back pain can limit family and professional life in a wide variety of contexts.⁵

The intensity of pain cannot be determined simply by the appearance of the back. In a study of 3,369 people, the changes observed on imaging generally showed only a weak association with pain experienced or measured six years later. Nearly all discrepancies were less than one point on a scale of ten.⁷ This does not mean that imaging is useless: its results must be compared with symptoms and a physical examination.

The following categories will help you understand what your healthcare professional is looking for during the evaluation.

What is the difference between specific and nonspecific pain?

Nonspecific low back pain means that, following evaluation, no specific disease or injury can explain the symptoms.² The healthcare professional first looks for signs of a fracture, infection, cancer, or nerve damage that would require a different course of treatment. The term “nonspecific” does not mean that the pain is imaginary. It does not preclude the need for further evaluation if the symptoms change.

Specific pain can result from a fracture, an infection, or a tumor, among other causes. A herniated disc—when part of a disc protrudes beyond its normal boundaries—can irritate a nerve. Spinal stenosis is a narrowing of the space through which the nerves pass. Both of these conditions can also occur without pain; the examination determines whether they are consistent with your symptoms.

How does your pain behave?

Pain may increase or decrease depending on your movements and positions. Your physical therapist observes these reactions along with your other symptoms, your abilities, and your goals. The examples in the table are not rules that apply to everyone.

Responding to movement can help you choose a starting point, and then the plan adjusts as things progress. Our guide on lumbar directional preference explains how to identify the direction that brings you relief.

What is the difference between acute and chronic pain?

Acute pain lasts less than six weeks; chronic pain persists for more than twelve weeks. Pain that falls between these two categories is referred to as subacute. These time frames do not measure the intensity of the pain.⁸

In some people, central sensitization contributes to pain: the brain and spinal cord—the nerve cord within the spine—react more strongly to the signals they receive.¹⁰ Studies have found small average differences in certain tests, but these results do not allow for the identification of this phenomenon in every individual. There is no single gold-standard test in humans to confirm central sensitization—that is, increased reactivity of the brain and spinal cord circuits that transmit nerve signals within the spinal column.^{9, 11} This mechanism cannot be inferred from duration alone and does not, by itself, indicate the condition of the tissues. Chronic pain can nevertheless improve, even several months after its onset.¹²

What actually causes back pain?

Back pain can be influenced by the condition of the tissues, physical activities, nerve sensitivity, sleep, and stress.⁵ A specific cause cannot always be identified. Genetics and the environment also contribute to changes in the discs. In twin studies, physical labor was found to account for these changes to a lesser extent than previously thought.¹³ These findings regarding the discs do not mean that genes determine your pain.

What is the biopsychosocial model?

The biopsychosocial model considers the body, emotions, and life context as a whole. For example, disrupted sleep, anxiety about movement, and challenging work tasks can all influence how back pain is experienced. This approach acknowledges that pain is real, without reducing it to a single image or a single factor.⁴

Why do imaging studies show changes in people who aren't experiencing pain?

Magnetic resonance imaging (MRI) produces detailed images using a magnetic field. It also reveals changes that do not cause pain. Disc degeneration is characterized, in particular, by a loss of water content or a reduction in disc height. A bulge protrudes beyond the disc’s outline over a large area. A protrusion is a type of herniation: a localized portion protrudes, but its base remains wider than the protruding part. The table presents age-specific estimates for people with no history of back pain. Our article on the usefulness of medical imaging explains how to interpret these results.

In another study of 98 adults without pain, 27% had a protrusion and 1% had an extrusion—a herniation in which the protruding portion is wider than its base in at least one imaging plane. These results apply to all adults in the study and are not specific to 40-year-olds.¹⁷

Some changes become more common with age and are painless.¹⁶ An imaging result must therefore be interpreted in conjunction with the symptoms and physical examination. In a study involving 283 people with a lumbar herniated disc and sciatica—pain radiating down the leg—84% reported a complete or nearly complete resolution of their symptoms after one year. These participants were followed as part of a trial comparing surgery with prolonged conservative management—that is, treatment without initial surgery. This figure does not predict the resolution of all leg pain based on the initial MRI. At the one-year follow-up of the sciatica trial described above, a herniation remained visible in 35% of participants with a favorable outcome and 33% of those with an unfavorable outcome. The MRI performed at one year did not clearly distinguish between participants who had recovered and those who had not.¹⁸

Imaging reports can also vary. A 63-year-old woman underwent ten lumbar MRIs at ten different centers over the course of three weeks. The reports contained 49 distinct findings, 16 of which appeared in a single report; no finding appeared in all ten reports.¹⁹ This case illustrates potential variability, though it does not measure its frequency across all patients. Your healthcare provider can help you understand which results align with your symptoms.

How do stress and sleep affect pain?

Stress can affect attention, sleep, and how symptoms are experienced.¹⁰ A study of people with persistent pain in multiple areas of the body found lower cortisol levels at certain times of the day. Cortisol is a hormone—a chemical messenger in the body—that plays a role in the stress response. Depression and anxiety altered this association. The study does not prove that this hormonal change causes back pain.²⁰

Sleep and pain can influence each other in both directions.²¹ If you live with chronic pain, keeping track of your sleep and symptoms can help you identify issues to discuss with your healthcare provider. A review notes that sleep problems may precede an increase in pain, but the relationship varies among individuals and across studies.²¹

When should I seek urgent care?

Back pain accompanied by new urinary problems, numbness around the genitals, or symptoms in both legs requires immediate evaluation in the emergency department. Other signs require a same-day or prompt medical evaluation, as specified in the table. Do not wait six weeks if a concerning sign appears.^{22, 23}

What specific conditions can cause lower back pain?

A herniated disc that irritates a nerve, a fracture, an infection, or a tumor can cause lower back pain. Narrowing around the nerves or certain joints can also contribute to the symptoms. Your medical history and a physical exam help rule out these possibilities; imaging alone is not enough.⁵ The table lists common diagnoses and symptoms, along with their limitations.

What other conditions can affect the lower back?

Spondylolisthesis: a vertebra slips forward relative to the one below it. Mild degenerative forms are often asymptomatic.²⁷ Another review found no clear link between pain and isthmic spondylolisthesis—which is caused by a defect in a small bony portion of the vertebra—in the general adult population.²⁸ These results do not rule out the possibility that a slippage may contribute to a given individual’s symptoms.²⁹

Degenerative disc disease: changes in a disc, such as a loss of water content and height. These changes become more common with age and may remain painless. One review estimates that 68% of people with no history of back pain have disc degeneration by age 40.¹⁶

Sacroiliac pain: pain that may originate in the joint connecting the sacrum—the bone at the base of the spine—to the pelvis.³⁰ Several tests that replicate the typical pain may increase the likelihood that this joint is the cause. No single test is sufficient on its own.³¹ Its range of motion is usually limited.³² These tests do not prove that the pelvis is misaligned.

Two other possible diagnoses are: lumbar facet syndrome, pain attributed to the small joints at the back of the vertebrae; and lumbar radiculopathy, a condition affecting the portion of a nerve that exits the spine. This condition can alter strength, sensation, or reflexes in the leg.

What myths should I stop believing?

The myths about a fragile back, perfect posture, core muscles being the inevitable culprits, and prolonged rest paint a misleading picture of back pain. Pain does not automatically mean that the back is damaged. An evaluation helps determine the necessary precautions and, subsequently, when to resume activities.³³

Is there an ideal posture for preventing pain?

No single posture is universally good or bad. Studies on posture and back pain yield mixed results: some find a link, while others do not. A link does not prove that a posture causes pain.³⁴ Studies on spinal curvature do not establish a consistent link to pain.³⁵

Your back can handle a wide variety of positions. No single posture is inherently bad; however, varying your positions and moving within your comfort level may be more comfortable.

Do you need to strengthen your core muscles to feel better?

Core strengthening can be part of the treatment, but it is not necessary to follow just one type of program. Muscle strength and control alone are not enough to explain all pain.³⁹ Exercises should be chosen based on your abilities, your goals, and how your body responds.

For chronic nonspecific low back pain, exercises that improve core muscle control are likely to reduce pain more than minimal intervention. A review of 32 trials compared these exercises to other exercises and manual therapy for both recent and chronic pain. The differences observed were not large enough to be clinically significant for patients. Manual therapy uses the hands to move a joint or work on the muscles.⁴⁰ The stabilizing muscles, which help maintain core stability during your movements, are assessed based on the tasks that cause you difficulty. Our movement rehabilitation program can help improve control and coordination, for example, when standing up from a chair or moving a load.

How does back pain change over time?

Recent lower back pain often improves significantly during the first few weeks, after which the rate of improvement slows. Pain that is already persistent tends to improve more slowly on average.^{41, 8} Feeling better does not always mean that all symptoms have disappeared. Episodes may also recur after an improvement.⁴²

In a review of acute low back pain, pain and functional limitations decreased by an average of 58% in the first month, with further improvements continuing up to three months.⁴¹ A more recent review found an average decrease in acute pain from 56 to 26 out of 100, six weeks after enrollment in the studies. For pain that had been present for three to twelve months at baseline, the average decrease was from 56 to 48, with very uncertain evidence.⁸ These averages describe groups receiving various types of care; they do not determine your specific timeline for recovery.

Pain that lasts longer than three months isn't necessarily permanent.⁴³ The term “chronic” describes its duration, without predicting its future.⁸ In a follow-up study of 406 people whose episode had just reached three months—and who did not have nerve root pain—41% had fully recovered one year after entering the chronic phase.¹² This result does not automatically apply to pain that has been present for several years.

Factors associated with a less favorable recovery:

• Avoiding activities out of fear of injury may be associated with a slower return to work, especially during the subacute phase. This link to recovery is less clear for very recent or chronic pain⁴⁴.
  
• Distress and negative expectations may be associated with a slower recovery following a recent episode⁴⁵
  
• Talking about the fear of returning to work helps identify tasks that are being avoided and adjustments to consider⁴⁴
  
• A claim for compensation and depression were associated with a slower recovery in a follow-up study. This association does not prove that the claim causes the pain to persist⁴⁶
  
• Work-related difficulties, such as dissatisfaction or a dispute, should be discussed in order to arrange for support and a return to work

Persistent pain may be associated with several factors. More severe initial pain, difficulties with daily activities, distress, and negative expectations are among the factors linked to a less favorable course of recent pain. These associations do not prove that any single factor alone causes persistence.⁴⁵

What role does physiotherapy play?

Physical therapy helps reduce pain and restore your ability to perform daily activities through education, exercises, and a tailored progression plan. Manual therapy may be used to supplement this treatment as needed.^{47, 48, 49} The treatment plan takes into account the activities you want to be able to do again, such as walking, sitting, or lifting your child.

Physical therapy is one of the recommended options for several types of low back pain, depending on the clinical situation. The guidelines recommend appropriate nonsurgical management, which may include physical therapy.^{47, 50}

Our physical therapists tailor exercise programs to your abilities and the activities you want to resume.

The McKenzie Method, among other things, assesses whether certain movements reduce symptoms or cause them to travel from the leg back toward the back. This response, when present, can guide the initial selection of exercises.

Consult our Physiotherapy for Low Back Pain guide for detailed strategies.

Physical therapy can reduce pain and improve functional ability, particularly through exercise in cases of nonspecific chronic low back pain. The average benefits remain modest and vary depending on the treatment and the comparison group.

A 2021 Cochrane review, which synthesizes the results of comparative trials, found that exercise reduces pain by about 15 points out of 100 more than no treatment, usual care, or a sham treatment. The difference in disability scores was about 7 points out of 100, below the threshold the authors had defined as clinically significant. These results apply to adults with nonspecific pain lasting more than twelve weeks at the first follow-up measurement.⁵³ The plan can combine therapeutic exercises, manual therapy, and educational guidance based on your needs.

A 2025 review limited to comparisons with a placebo—a sham treatment—also found a small benefit of exercise for chronic pain. For pain lasting less than twelve weeks, it found no clear benefit of exercise programs for pain compared with a placebo.⁵⁴ This limitation does not mean you should stay in bed or that all physical therapy is useless. Assessment, counseling, and the gradual resumption of activities address other needs. Exercise may cause muscle soreness; its intensity is adjusted based on your response.

Our physical therapy guide for lower back pain outlines the costs to consider and the coverage available following a workplace or traffic accident. For an evaluation, see our services for back pain.

How to tell if your treatment is working and what to remember?

Treatment is effective when your daily activities become easier, your pain decreases, or you’re better able to manage your symptoms. Follow-up care compares these changes to the goals you set at the beginning. Pain, sleep, medication, and confidence may change at different rates.⁵⁵

Pain and your ability to perform daily activities are measured separately. A questionnaire can track, for example, whether walking or household chores are becoming easier.^{56, 57} You should also work with your healthcare provider to set specific benchmarks, such as the duration of a walk.

The plan aims to gradually increase independence: knowing which movements to try, how to adapt an activity, and when to ask for help. A lack of progress calls for a discussion and, at times, a new evaluation. Any changes to your medications should be discussed with the prescribing healthcare professional or your pharmacist.

Key points to remember:

A single image is not enough to explain the pain. The course of recovery varies, and the plan can support a gradual return to activities based on the individual’s abilities and goals.⁵⁸

1. Back pain doesn't automatically mean your back is weak. Movement can help you regain your strength. However, a specific injury may require precautions.⁴

2. An image doesn't tell the whole story. Changes in the disc can occur without causing pain. Your healthcare provider will determine whether the image is consistent with your symptoms and exam findings.⁷

3. Recent lower back pain often improves during the first few weeks. Persistent pain may also subside, although recovery is generally slower.³

4. Activity is gradually resuming. It is generally recommended to stay active rather than stay in bed.³⁷

5. Appropriate explanations can help. Education can help some people better understand their symptoms and resume their activities with less apprehension.⁵⁹

6. Your pain is still real even when stress affects it. Sleep, emotions, and activities can be discussed along with other factors.¹⁰

7. Clear and appropriate explanations can reassure some people with acute or subacute lower back pain. They may also slightly reduce the number of back-related medical visits⁶⁰.

8. Recovery takes time. A temporary worsening of symptoms does not necessarily mean the treatment has failed. However, the warning signs described above do require a reevaluation.

9. Your pain is real. The absence of structural findings does not make your suffering any less real.

10. Some factors can be modified. The plan can address activities, sleep, worries, and coping strategies that seem relevant.

Our physical therapists combine all of these approaches into a personalized program. Learn more about our services for muscle tightness, stiffness, and loss of mobility.

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