Why Sciatica Keeps Coming Back (Even After Injections or Physical Therapy)

Sciatica is one of the most common causes of nerve pain in adults, yet it is also one of the most misunderstood. Many people experience a sudden episode of sharp pain in the lower back, hip, or leg that makes everyday movements difficult. Walking, sitting, bending, or even sleeping can become uncomfortable.

For some individuals, the symptoms improve within a few weeks. But for many others, the pain eventually returns.

You may try physical therapy, medications, or steroid injections. The symptoms improve temporarily… and then months later the pain comes back again.

If you are dealing with recurring sciatica, you are not alone. Millions of people experience this frustrating cycle every year.

Understanding why sciatica keeps coming back often requires looking beyond temporary symptom relief and examining the underlying mechanics of the spine.

What Sciatica Actually Is

Despite how commonly the term is used, sciatica is not technically a diagnosis. Instead, it is a symptom caused by irritation or compression of the sciatic nerve.

The sciatic nerve is the largest nerve in the body. It begins in the lower spine, travels through the hips and buttocks, and runs down the back of each leg.

When this nerve becomes irritated or compressed, it can produce symptoms such as:

• Sharp or burning pain in the lower back
• Pain that travels down the leg
• Tingling or numbness in the leg or foot
• Weakness in the leg
• Pain that worsens when sitting

In most cases, the source of sciatic nerve irritation is not in the leg at all — it originates in the lower spine.

Several spinal conditions can contribute to sciatica, including:

• Bulging discs
• Herniated discs
• Degenerative disc disease
• Spinal stenosis
• Loss of disc height

If you're unsure which of these may be contributing to your symptoms, you may find it helpful to read Bulging Disc vs Herniated Disc: What’s Actually Causing Your Pain?

Why Sciatica Often Improves — But Doesn't Go Away

One of the most confusing aspects of sciatica is that symptoms often improve temporarily, even without aggressive treatment.

This happens because the body is capable of reducing inflammation around irritated nerves over time.

When inflammation decreases, symptoms may improve. This is why people often experience relief with treatments such as:

• Rest
• Anti-inflammatory medications
• Physical therapy
• Steroid injections
• Activity modification

However, these treatments typically focus on calming inflammation rather than addressing the structural problem inside the spine that may be compressing the nerve.

If that structural issue remains, symptoms may return later.

This leads to the pattern many patients experience:

Pain → Treatment → Relief → Recurrence

Understanding this cycle is critical when exploring long-term solutions.

The Mechanical Cause Behind Recurring Sciatica

Inside the spine are small shock-absorbing cushions known as intervertebral discs. These discs sit between the vertebrae and allow the spine to move, bend, and absorb stress from daily activity.

Healthy discs maintain proper spacing between the vertebrae and help protect nearby nerves.

Over time, however, discs can begin to degenerate or become damaged. This may result in:

• Disc bulging
• Disc herniation
• Disc dehydration
• Loss of disc height

When these changes occur, the space available for spinal nerves may decrease. If the sciatic nerve roots become compressed or irritated, pain can travel along the nerve pathway and down the leg.

Even if inflammation improves temporarily, the mechanical pressure on the nerve may still remain, making future flare-ups likely.

Why Sitting Can Make Sciatica Worse

Modern lifestyles often involve long periods of sitting — at desks, in cars, or while using digital devices.

Unfortunately, sitting places more pressure on spinal discs than standing or walking.

Over time, prolonged sitting can contribute to:

• Increased disc pressure
• Disc bulging or herniation
• Reduced disc hydration
• Greater nerve compression

For individuals with disc injuries, sitting for long periods can trigger or worsen sciatic pain.

If sitting seems to aggravate your symptoms, you may want to read Why Sitting Is Quietly Destroying Your Discs.

Why Steroid Injections Often Provide Temporary Relief

Steroid injections are commonly used to treat sciatic nerve pain because they deliver powerful anti-inflammatory medication directly around irritated nerves.

For some patients, injections can provide noticeable relief.

However, steroid injections typically do not correct the underlying structural issue affecting the disc or nerve.

Because of this, relief may last only weeks or months before symptoms return.

Why Physical Therapy Helps Some Patients — But Not All

Physical therapy is an important component of many back pain recovery plans.

Therapy can help improve spinal mobility, strengthen supportive muscles, and reduce strain on the spine.

For many individuals, physical therapy plays a valuable role in improving symptoms and preventing further injury.

However, strengthening muscles alone may not fully address disc pressure inside the spine.

If a disc continues to bulge or lose height, nerve compression may persist even when surrounding muscles are stronger.

This is one reason some people improve during therapy but experience recurring sciatic pain months or years later.

Why MRI Results Can Be Confusing

Imaging tests such as MRI scans are commonly used to evaluate spinal conditions.

However, imaging findings do not always perfectly match symptoms.

Some people have severe pain with only minor changes visible on imaging, while others show significant disc degeneration but experience minimal symptoms.

This happens because MRI scans cannot always show:

• Dynamic changes in disc pressure during movement
• Temporary nerve irritation
• Inflammation affecting nerve roots

If you have been told your MRI looks normal despite ongoing pain, you may want to read Why Your MRI Says “Normal” But You Still Have Pain.

The Role of Spinal Decompression Therapy

Because disc pressure is a major contributor to many cases of sciatica, some conservative treatments aim to address this mechanical factor.

One such approach is non-surgical spinal decompression therapy.

Spinal decompression therapy uses a specialized computerized table to gently stretch the spine using controlled traction forces.

This process may help:

• Reduce pressure inside spinal discs
• Improve spacing around spinal nerves
• Encourage fluid movement within discs
• Support disc healing

You can learn more about the mechanics behind this therapy in How Spinal Decompression Works (A Mechanical Explanation).

What Happens During a Decompression Session?

Many patients are curious about what spinal decompression therapy feels like.

During a session:

• The patient lies comfortably on a decompression table
• A harness supports the hips or torso
• Gentle traction cycles slowly stretch and relax the spine

Most sessions last approximately 10–20 minutes and are performed in a clinical setting under supervision.

If you would like to learn more about the treatment process, see What Happens During a Spinal Decompression Session.

When Surgery May Be Necessary

Although many cases of sciatica respond to conservative care, surgery may sometimes be necessary.

Situations where surgery may be recommended include:

• Severe nerve damage
• Progressive muscle weakness
• Loss of bowel or bladder control
• Significant spinal instability

Surgery can be an important option for certain spinal conditions.

To better understand when surgical treatment may be appropriate, read When Is Back Surgery Actually Necessary?

Understanding the Different Types of Sciatica

Not all sciatica is caused by the same underlying condition.

Sciatic nerve pain can originate from:

• Disc compression
• Spinal stenosis
• Muscle irritation such as piriformis syndrome
• Degenerative spinal changes

Because the cause varies, treatment approaches should be tailored accordingly.

You can learn more in The 3 Types of Sciatica (And Why Treatment Must Match the Cause).

Could You Be a Candidate for Spinal Decompression?

Non-surgical spinal decompression is not appropriate for every type of back pain, but it may be considered for individuals experiencing disc-related spinal conditions.

Patients who may benefit from decompression therapy often experience:

• Chronic lower back pain lasting several months or longer
• Sciatica symptoms traveling down the leg
• Disc bulges or herniations visible on imaging
• Pain that worsens with sitting or bending
• Limited improvement with other conservative treatments

If these symptoms sound familiar, you may want to read How to Know If You’re a Candidate for Non-Surgical Spinal Decompression.

If you are experiencing recurring sciatic nerve pain, identifying the underlying cause is an important first step.

Schedule an evaluation to discuss your symptoms and learn whether spinal decompression or another conservative therapy may be appropriate for your condition.

If disc pressure or nerve irritation may be contributing to your symptoms, spinal decompression therapy may be one option to consider.

Learn more by visiting our complete guide to Non-Surgical Spinal Decompression for Chronic Back Pain and Sciatica.