Sciatica radiating from the lower back down to the leg: how can it be distinguished?

When pain starts in the lower back or buttocks and radiates down the back of the thigh, calf, and foot, it is commonly referred to as sciatica.

Sciatica refers to pain that radiates from the sciatic nerve or lumbar nerves down into the leg. The cause may be lumbar disc herniation, spinal canal stenosis, degenerative changes of the spine, or other nerve-related problems.

Additionally, pain originating from the joints of the lumbar spine and pelvis or from the gluteal muscles may be transmitted to the leg, causing symptoms that feel like sciatica.

Therefore, we do not definitively diagnose disc herniation or sciatica based solely on pain pathways.

• Pain radiating from the lower back or buttocks down to the leg
• A sharp or electric shock-like sensation
• A pulling or burning pain
• Numbness in the legs and feet
• Diminished sensation or a feeling that the left and right sides are different.
• Weakness in the ankle or toes
• Symptoms vary depending on whether the patient has been sitting for a long time, standing, or walking.
• Leg pain worsens with coughing or sneezing

The fact that pain has spread down to the foot does not necessarily mean the condition is more severe. Changes in muscle strength and sensation, as well as gait, may be more important than the distance of pain.

Lumbar disc herniation and nerve irritation

If a disc protrudes or herniates and stimulates the lumbar nerve, pain and numbness may occur in specific areas of the leg.

Stenosis of the spinal canal or neural foramen

If the space through which nerves pass becomes narrow, leg symptoms may worsen when standing or walking.

Degenerative changes of the spine

Changes in the spine, joints, and ligaments may affect the neural pathways.

Referred pain in the lower back and pelvis

Pain in the lumbar joints, pelvis, and buttock muscles may be transmitted to the legs. In this case, there may be no obvious muscle weakness or sensory loss.

Hip and peripheral nerve issues

Nerve irritation around the hip, knee, calf, or ankle may cause similar symptoms.

The path the pain takes down the leg

We check where it starts (in the lower back or buttocks) and which direction it extends (to the thigh, calf, or foot).

Lumbar movement

We examine how leg pain changes during flexion and extension, sitting and standing.

Nerve stimulation test

You can check whether the leg pain you usually feel is reproduced when you lift your leg or change your posture.

Muscle strength and sensation

Compares the strength of the knee, ankle, and toes, as well as sensation in the legs and feet from left to right.

Reflexes and Gait

We check the reflexes of the knee and ankle, walking on the heels and toes, and whether the foot drags.

Hip and peripheral nerves

To distinguish causes other than the lower back, we can also examine hip movement, buttock muscles, and nerves around the knees and ankles.

Through such history taking and physical/neurological examinations, we determine whether general musculoskeletal treatment can be initiated or if an MRI or consultation is needed first.

If you have the following symptoms, a prompt medical evaluation may take precedence over standard treatment for sciatica.

• If leg muscle strength suddenly decreases or weakens rapidly
• If it is difficult to lift the ankle or toes
• If your leg drags or you feel unstable while walking
• If pain and numbness in both legs suddenly worsen
• Changes in bowel and bladder control
• Reduced sensation in the perineum
• If symptoms occur along with severe trauma or high fever

The presence of leg pain alone does not mean that an MRI is immediately necessary for all patients.

In the following cases, MRI may be considered.

• If muscle weakness progresses
• If there are changes in urination and defecation, or sensation in the perineum.
• If symptoms continue to worsen despite appropriate treatment
• When it is necessary to decide whether an injection or surgery is needed
• If infection, tumor, or other conditions are suspected

We must also examine whether the imaging results align with the current pain pathway, muscle strength, and sensation.

Activity and posture adjustment

Reduce postures that severely worsen pain, but maintain daily activities within a feasible range if there are no warning signs.

Rather than lying down for a long time, walking for a short period and frequently changing your posture may be helpful.

Chuna manual therapy

It may be considered as part of a treatment plan when there are no progressing neurological abnormalities and movement of the lower back and pelvis and joint and muscle function need to be managed together.

It cannot be explained that Chuna manual therapy alone can remove nerve compression or resolve all cases of sciatica.

Check the following before and after treatment.

• How far down the leg does the pain extend?
• Numbness and changes in sensation
• Ankle and toe strength
• Walking and sitting functions
• Movement of the lumbar spine and hip joint

Acupuncture treatment and pharmacopuncture treatment

It may be used selectively according to the patient’s condition after checking pain and muscle tension in the lower back, buttocks and legs.

Exercise and Rehabilitation

While confirming that nerve function is stable, we gradually restore movement of the lumbar spine and hip joint, lower limb muscle strength, and gait.

Avoid forcing a strong stretch to the end of your range while enduring symptoms.

Analgesics and neuropathic pain medications

It can play a role in reducing pain and numbness and aiding sleep and activity.

However, even if pain decreases with medication, muscle weakness or sensory changes may continue to progress. Medications that may cause drowsiness and dizziness should be considered together with the risks of driving and falls.

If repeated dosing is required or if symptoms recur immediately upon discontinuation of the medication, it is advisable to re-evaluate movement and nerve function.

Steroid injection and nerve block

If muscle strength and sensation are stable, much sciatica can be treated with the Chuna manual therapy, acupuncture, pharmacopuncture, and exercise described above. In the acute stage when pain is severe, injections are sometimes used alongside them, but effects are usually closer to short-term pain control, and repeating them accumulates burdens on blood sugar and bone health.

Rather than immediately resuming strenuous activity because pain has decreased after an injection, recovery continues while verifying whether actual muscle strength and movement have recovered.

Surgical evaluation

If muscle weakness progresses or bowel and bladder changes occur, prompt surgical evaluation is required. Surgery may also be discussed when severe leg pain and functional decline continue despite non-surgical treatment.

If there are no emergency red flags, there is no need to rush. In research on sciatica, surgery reduced pain more quickly, but outcomes after 1 year were similar to non-surgical treatment. Even after surgery, once the surgical site stabilizes, Korean medicine treatments such as Chuna manual therapy can help recover surrounding function, with the timing of initiation discussed with the surgical medical team.

• Record how far the pain travels and where the numbness or tingling occurs.
• We examine the strength of the ankle and toes, as well as changes in gait.
• We do not repeat the same movement to check for pain.
• If your leg drags, be cautious when driving and using stairs.
• Avoid correction by strong force or excessive stretching.
• If new changes in urination or defecation, or decreased sensation in the perineum occur, seek evaluation immediately.