Can Back Pain Cause Knee Pain? Understanding Referred Pain

Medical note: This article is for general education only and does not diagnose the cause of back, leg, or knee pain. Seek urgent care for severe injury, a very swollen or misshapen knee, inability to bear weight, a hot red knee with fever, new bowel or bladder problems, numbness around the groin or buttocks, or rapidly worsening weakness.

Can Back Pain Cause Knee Pain?

Yes. A lower-back problem can sometimes cause pain that is felt around the knee, especially when nerves that supply the leg become irritated.

However, this does not mean that all knee pain comes from the back. Knee pain may also come from arthritis, injury, tendon or ligament problems, or other conditions affecting the knee itself.

The key is understanding the pattern.

Some people notice pain that starts in the lower back or thigh and travels toward the knee. Others mainly feel knee pain, even when the source may involve the lower back or nerves.

This article explains how that connection can happen, what clues may suggest a back-related cause, and when it makes sense to request an evaluation.

How Can a Back Problem Cause Knee Pain?

Referred Pain vs. Nerve-Related Pain

There are two different ways a back problem may be connected to knee pain.

Referred pain means pain is felt in one area even though the source is somewhere else.

For example, irritation in the lower back may sometimes be perceived as pain in the thigh or knee area.

Nerve-related radiating pain is different. In this case, an irritated spinal nerve may cause pain that travels along the leg.

That pain may feel:

• Burning
• Shooting
• Electric
• Sharp
• Tingling
• Numb
• Weak

These terms should not be used interchangeably. Referred pain, sciatica, and radiculopathy describe different patterns and mechanisms.

If lower-back pain is part of your symptoms, see Valley Dolor’s Back Pain Treatment page.

Lower-Back Conditions That May Contribute

Some lower-back conditions may irritate nerves that supply the leg.

Examples can include:

• A herniated disc
• Spinal narrowing
• Degenerative changes affecting nearby nerves

Certain nerve patterns from the upper lumbar spine may produce symptoms in the front of the thigh or around the inner knee.

However, symptom location alone does not confirm a diagnosis.

Pain patterns are useful clues, but a clinician still needs to look at the full picture, including strength, sensation, reflexes, range of motion, and whether symptoms are also coming from the knee itself.

Signs Your Knee Pain May Be Related to Your Back

Knee pain may be more likely to involve the back or nerves when you notice a combination of symptoms such as:

• Pain that travels from the lower back or thigh toward the knee
• Burning, shooting, or electric pain
• Tingling or numbness
• Leg weakness
• Pain that continues below the knee
• Knee symptoms occurring with back or leg pain
• Symptoms that change with certain back movements or positions

It is also possible to have back-related knee pain without obvious back pain.

That can make the source harder to identify.

None of these signs proves that the problem is coming from the spine, but they may be useful reasons to look beyond the knee itself.

If your pain extends into the leg, you may also want to read about Leg Pain Treatment.

Could the Pain Be Coming From the Knee Instead?

Yes.

Many common knee problems can cause symptoms that overlap with back-related pain.

Possible knee-related causes include:

• Arthritis
• Meniscus injury
• Tendon problems
• Ligament injury
• Bursitis
• Overuse
• Joint irritation

Clues that the knee itself may be involved include:

• Local knee tenderness
• Swelling
• Stiffness
• Pain with weight-bearing
• Pain with stairs
• Pain after twisting or direct injury
• Locking or instability

It is also possible to have both a back problem and a knee problem at the same time.

That is why symptoms alone do not always reliably identify the source.

For more detail on knee-specific symptoms, see Knee Pain Treatment.

How Is the Source of Pain Evaluated?

A clinical evaluation usually starts with your history.

A clinician may ask:

• When did the pain begin?
• Did it start in the back, knee, or leg?
• Does the pain travel?
• Was there an injury?
• Does the knee swell?
• Do you have numbness or tingling?
• Does the leg feel weak?
• What movements make symptoms better or worse?
• Does walking, standing, or sitting affect the pain?

The physical examination may include both the back and the knee.

A clinician may assess:

• Back movement
• Knee movement
• Local tenderness
• Knee swelling
• Leg strength
• Sensation
• Reflexes
• Walking pattern

Additional testing depends on what the examination shows.

Not everyone with back and knee pain needs imaging.

The purpose of evaluation is to understand whether symptoms are more consistent with a knee problem, a back or nerve problem, or a combination of both.

When Should You Request an Evaluation?

Consider scheduling an evaluation if:

• Pain is persistent
• Symptoms are getting worse
• Pain repeatedly comes back
• Walking is becoming difficult
• Pain affects sleep
• Symptoms interfere with work or exercise
• Knee pain occurs with radiating leg pain
• You have tingling or numbness
• You notice weakness
• The source of pain remains unclear
• Knee-focused treatment has not helped

New or rapidly worsening weakness needs prompt assessment, not just a routine follow-up.

Urgent Warning Signs

Seek urgent medical care if you have:

• A very swollen knee
• A visibly misshapen knee
• Inability to bear weight
• A hot, red knee with fever
• Severe pain after a significant injury

Seek emergency care if back or leg pain occurs with:

• New loss of bladder or bowel control
• Difficulty urinating
• Numbness around the groin, genitals, buttocks, or inner thighs
• Rapidly worsening weakness
• Severe symptoms affecting both legs

These symptoms may indicate a serious condition that should not be managed as routine back or knee pain.

Request a Back and Knee Pain Evaluation in Newburgh

If you are not sure whether your knee pain starts in the knee itself or may be connected to your lower back or nerves, a professional evaluation can help clarify the pattern.

Valley Dolor provides individualized pain-management evaluations in Newburgh, NY, for patients with back pain, knee pain, leg pain, nerve-related symptoms, and chronic pain concerns.

Explore Back Pain Treatment

Explore Knee Pain Treatment

Explore Leg Pain Treatment

Frequently Asked Questions

Can lower-back problems cause knee pain without noticeable back pain?

Yes. Some nerve-related pain patterns can cause symptoms in the thigh or knee even when back pain is mild or not especially noticeable. A clinical evaluation is still needed because knee conditions can cause similar symptoms.

How can I tell whether knee pain comes from my back or my knee?

Pain that travels from the back or thigh, feels burning or electric, or occurs with numbness, tingling, or weakness may suggest nerve involvement. Swelling, local tenderness, or pain after a knee injury may suggest a knee-related source. These patterns are only clues, not a diagnosis.

Will treating a back problem help my knee pain?

Only if the knee pain is actually related to the back or nerves. Treating the back will not necessarily improve a separate knee condition. The first step is identifying the most likely source of the pain.