Author: DokterSingapura Editorial Team
Clinical review: Dr Terence Tan, licensed medical doctor in Singapore
Founder, The Pain Relief Clinic
Reviewed: May 2026

Many people with back pain eventually wonder:

“Should I get an MRI?”

This question becomes even more urgent when pain travels down the leg, feels nerve-like, or does not improve after rest, medication, or therapy.

Lumbar MRI can be very useful.

But it is not automatically needed for every episode of back pain.

The better question is:

Will MRI clarify the diagnosis or change the management plan?

What Lumbar MRI Can Show

Lumbar MRI gives detailed information about the lower spine, including:

• intervertebral discs
• nerve roots
• spinal canal
• facet joints
• soft tissues
• inflammation patterns
• spinal stenosis
• disc herniation
• nerve compression
• some bone marrow abnormalities

This makes MRI helpful when the clinical question involves nerve compression, persistent symptoms, or unclear structural causes.

However, MRI findings must be interpreted carefully.

Not every abnormal-looking scan explains pain.

Why MRI Is Not Always The First Step

Many episodes of back pain improve without advanced imaging.

This is one reason international guidelines discourage routine imaging for uncomplicated low back pain.

NICE guidance recommends considering imaging in appropriate care settings only when the result is likely to change management. (NICE)

This matters because MRI can reveal age-related findings that may not be the main cause of symptoms.

Examples include:

• disc bulges
• degenerative changes
• mild narrowing
• facet joint changes

These findings can sound frightening on a report, even when they may not fully explain the patient’s pain.

When Lumbar MRI May Be More Useful

1. Pain Travelling Down The Leg With Nerve Symptoms

MRI may be useful when back pain is associated with:

• pain below the knee
• tingling
• numbness
• burning pain
• weakness
• altered sensation

These symptoms may suggest nerve root irritation or compression.

MRI can help identify whether a disc, narrowing, or another structural issue is affecting the nerve.

2. Progressive Weakness

Weakness is more concerning than pain alone.

Examples include:

• foot drop
• difficulty lifting the toes
• leg giving way
• worsening muscle control
• progressive loss of strength

The American College of Radiology notes that severe or progressive neurological deficit and red flags are situations where MRI evaluation may be appropriate. (PubMed)

3. Persistent Symptoms Despite Appropriate Care

If symptoms remain significant after a reasonable period of conservative management, MRI may help clarify next steps.

This is especially relevant when:

• pain remains severe
• function is still limited
• leg symptoms persist
• treatment direction remains unclear

ACR appropriateness guidance notes that imaging may be considered when symptoms persist despite a period of medical management and physical therapy, especially if further intervention is being considered. (ScienceDirect)

4. Suspected Spinal Stenosis

Spinal stenosis means narrowing around the spinal canal or nerve pathways.

Possible symptoms include:

• leg pain when walking
• heaviness in the legs
• symptoms relieved by sitting or bending forward
• reduced walking distance
• numbness or tingling in both legs

MRI can help assess whether narrowing is present and whether it matches the symptom pattern.

5. Red Flag Concerns

MRI may be considered more urgently when concerning features are present.

These may include:

• history of cancer with new severe back pain
• fever or infection concern
• unexplained weight loss
• major trauma
• suspected fracture
• new bladder or bowel dysfunction
• numbness around the saddle area
• progressive neurological deficit

These situations require medical review.

When MRI May Be Less Useful

MRI may not be immediately useful when symptoms are:

• mild
• recent
• clearly improving
• not associated with neurological features
• consistent with uncomplicated mechanical back pain

This does not mean pain is not real.

It simply means MRI may not change the initial management plan.

According to Dr Terence Tan, imaging is most helpful when it answers a specific clinical question—not when it is ordered simply because pain exists.

MRI Findings Need Clinical Correlation

This is one of the most important points.

A scan may show:

• disc bulge
• disc protrusion
• degeneration
• narrowing
• facet changes

But the doctor still needs to ask:

• Does this match the pain pattern?
• Does it match neurological findings?
• Does it explain function loss?
• Would treatment change because of this finding?

Without clinical correlation, MRI can sometimes create confusion rather than clarity.

MRI vs X-Ray For Back Pain

X-rays and MRI answer different questions.

X-rays may help assess:

• alignment
• fractures
• major bony degeneration
• instability patterns in selected cases

MRI is better for:

• discs
• nerves
• spinal canal
• soft tissue
• nerve compression
• inflammatory or marrow-related concerns

One is not simply better for all situations.

The right scan depends on the question.

Practical Questions Before Getting MRI

Before lumbar MRI, it helps to ask:

• What diagnosis are we trying to confirm?
• Are there nerve symptoms?
• Is there weakness?
• Are symptoms improving or worsening?
• Would MRI change treatment?
• Are red flags present?
• Has conservative care already been tried appropriately?

These questions make imaging more purposeful.

The Main Takeaway

Lumbar MRI is valuable when used properly.

It is especially useful when there are persistent nerve symptoms, progressive weakness, red flags, spinal stenosis patterns, or unresolved diagnostic questions.

But for uncomplicated back pain, MRI is not always the first or best step.

The goal is not simply to “find something” on a scan.

The goal is to connect symptoms, examination findings, and imaging into a practical care plan.

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FAQ

Does back pain always need MRI?

No. Many episodes of back pain do not require MRI, especially if symptoms are recent, mild, and improving.

Is MRI useful for sciatica?

It can be useful when sciatica symptoms are persistent, severe, worsening, associated with weakness, or when treatment decisions depend on imaging.

Can MRI show a slipped disc?

Yes. MRI can show disc herniation, disc protrusion, and possible nerve compression.

If MRI shows disc bulge, is that always the cause of pain?

No. Disc bulges can be present in people without symptoms. Imaging must be interpreted alongside clinical findings.

When should back pain be checked urgently?

Urgent review is needed for bladder or bowel changes, saddle numbness, progressive weakness, fever, major trauma, or cancer-related concerns.

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About The Medical Reviewer

Dr Terence Tan is a licensed medical doctor in Singapore and founder of The Pain Relief Clinic. He has over 20 years of clinical experience in musculoskeletal assessment and practical non-surgical care pathways.

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Medical Disclaimer

This article is for general educational purposes only and does not replace personalised medical assessment, diagnosis, or treatment by a licensed healthcare professional.

Author: DokterSingapura Editorial Team
Medical content reviewed by Dr Terence Tan, licensed medical doctor in Singapore
Founder, The Pain Relief Clinic
Reviewed: May 2026

“Sciatica” is one of the most commonly used words in back pain conversations.

But it is also one of the most misunderstood.

Many people use the term to describe:

• any back pain
• any buttock pain
• any leg pain
• any nerve-like discomfort

That creates confusion.

Because not all pain travelling from the lower back or buttock is true sciatica.

Understanding what sciatica actually means helps make treatment decisions more practical.

What Sciatica Actually Means

Sciatica generally describes symptoms caused by irritation, inflammation, or compression affecting nerve roots that contribute to the sciatic nerve.

The sciatic nerve is the largest nerve in the body.

It travels from the lower spine through the buttock and down the leg.

When relevant nerve roots become irritated, symptoms may radiate along that pathway.

Common symptoms may include:

• sharp shooting pain
• burning discomfort
• tingling
• numbness
• altered sensation
• weakness
• pain travelling below the knee

NICE guidance on low back pain and sciatica recognises sciatica as a distinct clinical pattern requiring assessment based on the overall symptom picture—not just a single symptom label.

Myth 1: All Buttock Pain Is Sciatica

False.

This is one of the most common misunderstandings.

Pain in the buttock may also come from:

• lower back joints
• sacroiliac joint irritation
• gluteal muscle overload
• tendon problems
• hip joint pathology
• referred spinal pain

Sciatica is not simply “pain in the backside.”

Myth 2: If Pain Goes Down The Leg, It Must Be A Trapped Nerve

Not always.

Pain travelling down the leg raises suspicion—but does not confirm nerve compression.

Other causes may include:

• referred mechanical pain
• hip-related pain
• muscular trigger points
• spinal stenosis without classic acute nerve root compression
• movement-related referred pain

According to Dr Terence Tan, many patients understandably focus on pain location, but the symptom behaviour, neurological findings, and clinical context usually matter far more.

Myth 3: Sciatica Always Means A Slipped Disc

False.

Disc-related nerve irritation is one possible cause.

But sciatica-like symptoms may also arise from:

• spinal stenosis
• degenerative narrowing
• inflammation
• foraminal narrowing
• less commonly, other structural causes

Disc issues are common—but not universal.

Myth 4: MRI Is Always Needed To Confirm Sciatica

False.

MRI can be helpful in selected cases.

But routine blanket imaging is not automatically recommended.

NICE advises imaging when the result is likely to change management—not as default imaging for every episode of back pain or sciatica.

MRI may be more relevant when:

• symptoms persist
• neurological symptoms worsen
• weakness develops
• diagnosis remains unclear
• intervention planning is required

Myth 5: Sciatica Always Needs Surgery

False.

This is a major fear for many patients.

Many cases improve without surgery.

The American College of Physicians supports conservative first-line approaches for many low back pain presentations, depending on clinical circumstances.

Conservative pathways may include:

• education
• activity modification
• guided movement
• walking progression
• symptom-directed medication where appropriate
• rehabilitation strategies

Surgery becomes relevant in selected situations—not automatically.

Myth 6: Bed Rest Is The Best Treatment

Outdated.

Prolonged bed rest is generally not recommended for routine sciatica management.

Appropriate movement is often preferable depending on severity.

Excess inactivity may worsen:

• stiffness
• deconditioning
• confidence loss
• delayed recovery

The exact approach should match the individual presentation.

Myth 7: Severe Pain Means Permanent Damage

Not necessarily.

Pain intensity and structural severity do not always correlate neatly.

Some people with dramatic symptoms improve well.

Others with relatively modest pain may have persistent issues.

Clinical assessment matters more than emotional interpretation of pain intensity alone.

When Sciatica May Be More Concerning

Certain symptoms need more urgent attention.

Examples:

• progressive leg weakness
• numbness around the saddle/groin region
• bladder or bowel dysfunction
• severe progressive neurological symptoms
• unexplained systemic illness features

These patterns warrant prompt medical assessment.

Practical Questions That Help

If symptoms suggest sciatica, useful questions include:

• Does pain travel below the knee?
• Is there numbness?
• Is there tingling?
• Is weakness present?
• What movements worsen symptoms?
• Is walking affected?
• Are symptoms improving or worsening?

These questions often guide decision-making better than self-labelling alone.

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FAQ

Is buttock pain always sciatica?

No.

Many non-nerve causes can create buttock pain.

---

Does sciatica mean a slipped disc?

Not always.

Disc-related irritation is one possible cause—not the only one.

---

Can sciatica improve without surgery?

Yes.

Many cases are managed conservatively depending on severity and neurological findings.

---

When should I seek urgent medical care?

If symptoms include progressive weakness, bladder or bowel changes, or numbness around the groin/saddle region.

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About The Medical Reviewer

Dr Terence Tan is a licensed medical doctor in Singapore and founder of The Pain Relief Clinic. He has over 20 years of clinical experience in musculoskeletal assessment and practical non-surgical care pathways.

---

Medical Disclaimer

This article is for general educational purposes only and does not replace personalised medical assessment, diagnosis, or treatment by a licensed healthcare professional.

Author: DokterSingapura Editorial Team
Clinical review: Dr Terence Tan, licensed medical doctor in Singapore
Founder, The Pain Relief Clinic
Reviewed: May 2026

Back pain that travels down the leg can feel worrying.

Some people describe it as:

“electric pain.”
“shooting pain.”
“a nerve pulling down the leg.”
“pain from the buttock to the calf.”

Many immediately assume:

“This must be sciatica.”

Sometimes that is correct.

But not every leg pain that starts near the back is true sciatica.

The practical question is:

Is the pain coming from nerve irritation, referred pain, muscle or joint structures, or something else?

What Is Sciatica?

Sciatica generally refers to pain related to irritation or compression of a nerve root that contributes to the sciatic nerve.

It may cause symptoms that travel from the lower back or buttock into the:

• back of the thigh
• calf
• foot
• toes

Some people also experience:

• tingling
• numbness
• burning pain
• weakness
• altered sensation

NICE guidance on low back pain and sciatica recognises that assessment should consider the full clinical picture, not just pain location alone. (NICE)

Not All Leg Pain From The Back Is Sciatica

This is important.

Pain may travel into the buttock or thigh without true nerve compression.

Possible alternative contributors include:

• lumbar facet joint irritation
• sacroiliac joint-related pain
• hip joint problems
• gluteal muscle irritation
• hamstring tendon issues
• spinal stenosis
• referred pain from degenerative spinal changes

This is why a simple symptom label can be misleading.

According to Dr Terence Tan, one common mistake is assuming every pain travelling below the buttock is automatically sciatica, when the pattern, neurological findings, and movement behaviour all matter.

Common Sciatica Patterns

Sciatica may be more likely when symptoms include:

• shooting pain below the knee
• tingling or numbness
• burning sensation
• pain worsened by coughing or sneezing
• weakness in the leg or foot
• clear nerve-like distribution
• symptoms made worse by certain spine positions

However, even these patterns require proper clinical interpretation.

When Back Pain Radiates Only To The Buttock

Pain limited to the buttock does not always mean sciatica.

Possible causes include:

• lower back joint irritation
• hip-related pain
• gluteal muscle overload
• sacroiliac joint discomfort

The location matters, but it is not enough on its own.

When Pain Travels Below The Knee

Pain travelling below the knee may raise stronger suspicion of nerve involvement, especially if accompanied by:

• numbness
• tingling
• pins and needles
• weakness
• altered reflexes

This pattern deserves more careful assessment.

When MRI May Be Useful

MRI is not automatically required for every case of back pain with leg symptoms.

NICE recommends that imaging should generally be considered only when the result is likely to change management, rather than as routine imaging for all low back pain or sciatica. (NICE)

MRI may be more relevant when:

• symptoms persist despite appropriate care
• neurological symptoms are present
• leg weakness develops
• diagnosis remains unclear
• severe or worsening symptoms occur
• procedural or surgical decisions are being considered

Red Flags: When To Seek Urgent Medical Attention

Some symptoms need urgent medical review.

These include:

• new difficulty passing urine
• loss of bladder or bowel control
• numbness around the groin or saddle area
• progressive leg weakness
• fever with severe back pain
• unexplained weight loss
• history of cancer with new severe back pain
• major trauma

These are not common, but they are important.

Conservative Care Is Often The Starting Point

Many back pain and sciatica cases are initially managed without surgery.

Depending on the case, conservative care may include:

• education
• activity modification
• guided exercise
• walking tolerance progression
• medication where appropriate
• manual therapy only as part of a broader package
• monitoring neurological symptoms

The American College of Physicians guideline recommends non-drug approaches as first-line options for many acute or subacute low back pain presentations, with treatment decisions tailored to the patient’s situation. (ACP Journals)

Why Diagnosis Matters Before Treatment

Different causes need different strategies.

For example:

• disc-related nerve irritation
• spinal stenosis
• hip-related referred pain
• muscular overload
• sacroiliac joint pain

may all feel similar to patients, but management may differ.

This is why persistent radiating pain should not be managed purely by guessing.

Practical Questions To Ask

If you have back pain travelling down the leg, consider:

• Does the pain go below the knee?
• Is there numbness or tingling?
• Is there weakness?
• What positions worsen or relieve symptoms?
• Did it start after injury?
• Is it improving or worsening?
• Are there red flag symptoms?

These answers help guide the next step.

---

FAQ

Is all back pain down the leg sciatica?

No. Leg pain can come from nerve irritation, but also from hip, joint, muscle, or referred pain sources.

Does sciatica always need MRI?

No. MRI is usually most useful when the result is likely to change management or when symptoms suggest a more significant nerve-related problem.

Can sciatica improve without surgery?

Yes. Many cases are initially managed conservatively, depending on severity and neurological findings.

When is leg pain from the back more concerning?

Symptoms such as progressive weakness, numbness around the groin area, or bladder and bowel changes require urgent medical review.

---

About The Medical Reviewer

Dr Terence Tan is a licensed medical doctor in Singapore and founder of The Pain Relief Clinic. He has over 20 years of clinical experience in musculoskeletal assessment and practical non-surgical care pathways.

---

Medical Disclaimer

This article is for general educational purposes only and does not replace personalised medical assessment, diagnosis, or treatment by a licensed healthcare professional.

Author: DokterSingapura Editorial Team
Clinical review: Dr Terence Tan, licensed medical doctor in Singapore
Founder, The Pain Relief Clinic
Reviewed: May 2026

A common complaint sounds like this:

“My knee feels stiff when I first stand up—but improves after I walk for a bit.”

Or:

“The first few steps are uncomfortable, then it loosens.”

This pattern is often called start-up pain or start-up stiffness.

It is common—but not specific to a single diagnosis.

The useful question is:

Why does the knee feel worse after rest, then better with movement?

What Is Start-Up Knee Stiffness?

This refers to discomfort, stiffness, or awkward movement that appears after a period of inactivity.

Examples:

• getting up from a chair
• standing after a long meeting
• getting out of the car
• rising from bed
• moving after prolonged sitting

Symptoms may include:

• stiffness
• aching
• tightness
• reduced confidence moving
• discomfort during the first few steps

Then symptoms partially improve.

Why This Happens

Several mechanisms may contribute.

Possible explanations include:

• joint stiffness after inactivity
• fluid redistribution within the joint
• reduced tissue movement after rest
• temporary muscle deactivation
• pain sensitivity changes
• mechanical stiffness
• inflammatory irritation

The specific reason depends on the underlying condition.

Knee Osteoarthritis: A Common Explanation

This pattern is commonly associated with osteoarthritis.

NICE guidance recognises activity-related joint pain and short-duration stiffness after inactivity as common osteoarthritis features.

Possible associated symptoms:

• stair discomfort
• aching with walking
• joint noise
• reduced walking tolerance
• mild swelling

But osteoarthritis is not the only explanation.

Patellofemoral Pain

Front-of-knee pain can also create this pattern.

Especially if symptoms occur with:

• standing from sitting
• stairs
• squatting
• prolonged sitting

This is sometimes called the “movie theatre sign” in older clinical language—discomfort after sitting for prolonged periods.

Movement changes load distribution and may temporarily ease symptoms.

Meniscus Or Mechanical Irritation

Some internal joint problems may also create:

• stiffness
• discomfort with early movement
• awkward first steps

This becomes more relevant if accompanied by:

• catching
• clicking
• swelling
• locking sensations

Deconditioning And Reduced Muscle Support

Sometimes the issue is less about joint damage and more about reduced movement capacity.

After inactivity:

• muscles may activate less efficiently
• joint control may feel poorer
• confidence loading the knee may drop

This can be especially noticeable after illness, reduced exercise, or prolonged sedentary periods.

According to Dr Terence Tan, start-up stiffness often reflects a functional loading issue rather than automatically indicating major structural damage.

Is It Always Arthritis?

No.

This is a very common assumption—but not always correct.

Younger adults may experience similar symptoms due to:

• kneecap pain
• deconditioning
• tendon-related issues
• movement mechanics

Older adults may have overlapping causes.

The symptom pattern alone does not confirm diagnosis.

When Should It Raise More Concern?

The pattern deserves closer review if accompanied by:

• swelling
• worsening pain
• instability
• locking
• significant walking limitation
• night pain
• sudden unexplained progression

Context changes interpretation.

Is MRI Needed?

Not automatically.

MRI may be considered when:

• diagnosis remains unclear
• symptoms persist
• structural questions remain
• conservative measures fail
• mechanical symptoms exist

Routine blanket imaging is usually unnecessary.

Practical Early Considerations

Depending on context:

• gradual movement after rest
• symptom-guided exercise
• strengthening
• walking tolerance progression
• activity pacing
• reassessment if worsening

The key is understanding the likely cause rather than reacting to the symptom pattern alone.

---

FAQ

Why does my knee loosen after walking?

Movement may improve joint fluid movement, muscle activation, and temporary mechanical stiffness.

---

Does start-up pain always mean arthritis?

No.

It is common in arthritis—but also seen in other knee conditions.

---

Should I force movement through stiffness?

Not blindly.

Appropriate movement often helps, but worsening pain patterns deserve attention.

---

When should I seek assessment?

If symptoms persist, worsen, or are associated with swelling, locking, instability, or meaningful functional decline.

---

About The Medical Reviewer

Dr Terence Tan is a licensed medical doctor in Singapore and founder of The Pain Relief Clinic. He has over 20 years of clinical experience in musculoskeletal assessment and practical non-surgical care pathways.

---

Medical Disclaimer

This article is for general educational purposes only and does not replace personalised medical assessment, diagnosis, or treatment by a licensed healthcare professional.

Author: DokterSingapura Editorial Team
Medical content reviewed by Dr Terence Tan, licensed medical doctor in Singapore
Founder, The Pain Relief Clinic
Reviewed: May 2026

Some people notice an odd pattern:

Walking on flat ground feels manageable.

Going upstairs is uncomfortable—but tolerable.

Yet going downstairs feels distinctly worse.

That difference is not unusual.

And it can provide useful clues.

The key question is:

Why does descending stairs provoke knee pain more than climbing up?

Going Down Stairs Loads The Knee Differently

Descending stairs places different demands on the knee compared with walking or stair climbing.

The quadriceps muscles must control the lowering motion.

The knee absorbs body weight while managing balance, impact, and movement control.

This increases forces across certain parts of the joint—especially around the kneecap.

That is why symptoms often appear more clearly during descent.

Common Causes Of Pain Going Down Stairs

1. Patellofemoral Pain (Front-Of-Knee Pain)

One of the most common explanations.

This involves irritation around the kneecap and its movement mechanics.

Typical features:

• pain at the front of the knee
• discomfort with stairs
• pain after prolonged sitting
• symptoms with squatting
• pain standing from a chair

This pattern is especially common in younger and middle-aged adults.

According to Dr Terence Tan, stair-related front knee pain often reflects a movement-loading problem rather than a single dramatic structural injury.

2. Knee Osteoarthritis

Degenerative joint changes may also contribute.

Possible patterns:

• stiffness
• aching
• reduced walking tolerance
• pain with stairs
• joint noise
• swelling

The American College of Rheumatology supports exercise, education, and weight management as important components of non-surgical osteoarthritis care where clinically appropriate.

3. Quadriceps Weakness Or Deconditioning

Going downstairs requires controlled muscle braking.

If strength or endurance is reduced, the knee may experience higher stress.

This is common after:

• inactivity
• illness
• injury
• pain avoidance
• deconditioning

4. Meniscus Problems

Some meniscus issues may become noticeable during stair descent due to load transfer and knee bending mechanics.

Possible associated symptoms:

• joint line pain
• catching
• clicking
• swelling
• twisting discomfort

5. Movement Control Problems

Sometimes the issue is less about a damaged structure and more about:

• poor movement mechanics
• hip weakness
• altered alignment control
• compensatory movement patterns

This can change load distribution.

Why Going Down Feels Worse Than Going Up

A practical explanation:

Going upstairs uses active lifting.

Going downstairs requires controlled lowering under load.

That braking demand often exposes:

• weakness
• pain sensitivity
• movement inefficiency
• joint irritation

This explains why symptoms may appear selectively.

Is It Always Arthritis?

No.

This assumption is common—but often incorrect.

Younger individuals with front-of-knee pain frequently do not have osteoarthritis.

Similarly, older adults with arthritis-like symptoms may also have overlapping movement or tendon contributors.

Clinical context matters.

Do You Need Imaging?

Not automatically.

Imaging decisions depend on:

• duration
• swelling
• locking
• instability
• injury history
• symptom progression
• diagnostic uncertainty

NICE guidance generally supports imaging where clinically appropriate—not routine blanket imaging.

When The Pattern Matters More

Questions worth asking:

• Is the pain at the front?
• Is swelling present?
• Was there an injury?
• Does the knee lock?
• Is instability present?
• Is it worsening?

These clues often guide practical next steps.

Practical Early Considerations

Depending on context:

• temporary activity modification
• symptom-guided strengthening
• movement review
• walking load adjustment
• rehabilitation progression
• assessment if symptoms persist

Generic “just exercise more” advice is not always useful if the movement pattern itself is contributing.

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FAQ

Why does my knee hurt more going downstairs?

Because descending creates controlled load absorption across the knee, especially around the kneecap.

---

Is front knee pain usually arthritis?

Not necessarily.

Patellofemoral pain is a common alternative explanation.

---

Should I avoid stairs completely?

Not automatically.

Short-term adjustment may help, but long-term management depends on the underlying cause.

---

Does this mean I need MRI?

No.

Imaging depends on the wider symptom picture.

---

About The Medical Reviewer

Dr Terence Tan is a licensed medical doctor in Singapore and founder of The Pain Relief Clinic. He has over 20 years of clinical experience in musculoskeletal assessment and practical non-surgical care pathways.

---

Medical Disclaimer

This article is for general educational purposes only and does not replace personalised medical assessment, diagnosis, or treatment by a licensed healthcare professional.