What Causes Chronic Back Pain? A Neurosurgeon Explains

Published: 10 July 2026  |  Medically reviewed by Dr. Arun Saroha (Neuro & Spine Surgeon)  |  Spine and Brain India

What Counts as "Chronic" Back Pain?

Back pain is usually grouped by how long it lasts. Acute pain comes on suddenly — after lifting something awkwardly or a bad night's sleep — and typically improves within a few days to six weeks. Subacute pain lingers between six and twelve weeks. Pain is called chronic when it persists for twelve weeks or longer, often continuing even after the original strain or injury has healed.

This time distinction is important because chronic pain behaves differently. It is frequently the result of several overlapping factors rather than a single injury, and the nervous system itself can become more sensitive over time, amplifying pain signals. That is why treating chronic back pain well means looking at the whole picture — the spine, the muscles, posture, activity levels and lifestyle — not just chasing one quick fix.

The Most Common Causes of Chronic Back Pain

Chronic back pain rarely has just one neat cause. More often, everyday habits and the natural changes that come with age combine to keep the pain going. Identifying the main contributors helps both treatment and prevention. Here are the causes seen most often in clinical practice:

• Degenerative Disc Disease: With age, the cushioning discs between the vertebrae lose water and height and become less springy. This natural wear is extremely common and is one of the leading sources of ongoing lower back pain.
• Herniated or Slipped Disc: When the soft inner part of a disc bulges or leaks out, it can press on a nearby nerve. This often causes pain that shoots down the leg (sciatica), along with tingling or numbness.
• Spinal Stenosis: A narrowing of the spinal canal, usually from age-related changes, that squeezes the nerves. It classically causes back and leg pain that worsens with standing or walking and eases when leaning forward or sitting.
• Facet Joint Arthritis: The small joints that link the vertebrae can wear down and become inflamed, causing stiffness and a deep, aching pain that is often worse in the morning or after rest.
• Spondylolisthesis: When one vertebra slips forward over the one below it, it can irritate nerves and destabilise the spine, leading to persistent pain and sometimes leg symptoms.
• Muscle and Ligament Strain: Long-standing poor posture, weak core muscles, repeated heavy lifting or prolonged sitting can keep the back muscles overworked and painful for months.
• Postural and "Desk-Job" Overload: Hours hunched over a laptop or phone place constant, uneven load on the lower spine — one of the fastest-growing reasons younger adults now develop chronic back pain.
• Less Common but Serious Causes: Occasionally, infection, inflammatory arthritis (such as ankylosing spondylitis), fractures or tumours can be responsible. These are uncommon and usually come with other warning signs that a doctor will look for.

Mechanical vs Nerve-Related Pain: Why It Matters

One of the most useful things a specialist does is work out whether your pain is mainly mechanical or nerve-related, because the two are treated differently.

Mechanical pain comes from the structures of the spine itself — the discs, joints, muscles and ligaments. It tends to stay in the back or buttock, changes with movement and position, and often eases with rest and improves with exercise and posture correction. Most chronic back pain falls into this group and responds well to conservative care.

Nerve-related (radicular) pain happens when a nerve is compressed or irritated, usually by a herniated disc or stenosis. It typically radiates into the leg along a defined path and comes with tingling, numbness or weakness in that leg or foot. This type needs closer evaluation, because ongoing pressure on a nerve — and especially on the spinal cord — can occasionally cause lasting problems if left untreated.

How the Cause of Chronic Back Pain Is Diagnosed

Accurate treatment starts with an accurate diagnosis. A specialist will first take a detailed history — when the pain started, where it travels, what makes it better or worse — followed by a physical and neurological examination that checks movement, muscle strength, sensation and reflexes. In a large number of cases, this alone points to the likely cause.

When more clarity is needed, targeted investigations are used to get to the root of the problem so that treatment can be precise:

• X-ray: Shows bone alignment, wear, disc-space narrowing and slippage.
• MRI: The most reliable scan for seeing discs, nerves and the spinal cord, and the clearest way to detect nerve or cord compression.
• CT scan: Useful for fine bony detail, especially after trauma or when planning surgery.
• Nerve conduction study / EMG: Assesses whether the nerves and muscles are working normally and confirms nerve involvement.
• Blood tests: Ordered when infection, inflammation or an arthritic condition is suspected.

Treatment Options That Actually Help

Here is the reassuring reality: most chronic back pain is treated successfully without surgery. The guiding principle is to start with the simplest, safest measures and to consider surgery only when they are not enough or when there is serious nerve compression.

Conservative (non-surgical) care is the first choice for the great majority of people and usually includes:

• Physiotherapy and targeted exercise: The cornerstone of treatment — strengthening the core and back muscles, improving flexibility and retraining movement.
• Staying active: Gentle, gradual activity beats prolonged bed rest, which tends to make chronic pain worse.
• Medication as advised by your doctor: Short-term pain relief or anti-inflammatory medicines, used sensibly and never self-prescribed for long periods.
• Posture and ergonomics: Correcting how you sit, stand, sleep and use screens — often the single biggest long-term improvement.
• Weight management and lifestyle: Reducing excess weight, staying hydrated, and stopping smoking, which harms disc health.
• Injections: In selected cases with significant nerve inflammation, an epidural steroid injection or nerve block can provide relief and support rehabilitation.

Surgery is considered when there is progressive weakness, signs of spinal cord or severe nerve compression, instability, or disabling pain that has not responded to a proper course of conservative treatment. Modern techniques — including minimally invasive and endoscopic spine surgery, microdiscectomy, decompression and disc replacement — are now highly precise and allow many patients to recover and return to normal life quickly. Which path is right for you can only be decided by an experienced spine specialist after reviewing your symptoms and scans. Consulting a surgeon like Dr. Arun Saroha helps you understand your true diagnosis and the most appropriate option for your situation.

Everyday Steps to Protect Your Back

Preventing flare-ups is far easier than treating them, and small daily habits go a long way in keeping chronic back pain under control:

• Take a break from sitting every 30–45 minutes to stand, stretch and move.
• Keep screens at eye level and sit with your lower back supported.
• Strengthen your core and back muscles with regular, guided exercise.
• Lift with your legs, keep loads close to your body, and avoid twisting under weight.
• Maintain a healthy weight and stay well hydrated.
• Choose a supportive mattress and sleep in a spine-friendly position.
• Do not ignore early, mild symptoms — acting early is the best protection of all.