Sciatica: Pain That Travels Down a Leg

By the Kessler Spine & Rehab Clinical Team

Educational, not medical advice. Only a provider who has examined you can say what your symptoms or reports mean for you.

"Sciatica" is one of the most searched pain words, and people use it in different ways. Some mean any pain in the buttock or leg. Clinicians usually use it more narrowly. This guide explains what the word means, how it connects to a "pinched nerve" in the low back, what an exam looks for, and which symptoms need emergency care.

What Sciatica Means

The sciatic nerve is the largest nerve in the body. It forms from several nerve roots in the low back and runs through the buttock and down the back of the leg.¹

Sciatica describes pain that travels along that nerve's path, usually from the low back or buttock down the leg and sometimes into the foot. It may come with numbness, tingling, or weakness.² It usually affects one side.

Sciatica is a description of symptoms, not a diagnosis of the cause. When the symptoms come from an irritated nerve root in the low back, the clinical term is lumbar radiculopathy.³ Our article on "pinched nerve" pain that travels covers radiculopathy in the neck and low back.

Common Causes

• Disc herniation: the most commonly described cause. Disc material can press on or inflame a nearby nerve root.³ ⁴
• Spinal stenosis: narrowing of the canal or the nerve openings, more common with age. See Spinal Stenosis in Plain English.
• Spondylolisthesis: one vertebra positioned forward on the one below, which may narrow the space for a nerve. See Spondylolisthesis.
• Other sources: irritation involving a muscle deep in the buttock (piriformis syndrome), pelvic injury or fracture, and, less often, tumors.² Hip problems can also cause leg pain that feels similar but isn't true radiculopathy.

What Sciatica Can Feel Like

People describe it in different ways:

• A sharp, burning, or electric pain from the buttock down the leg
• Leg pain that is worse than the back pain
• Numbness or pins and needles in part of the leg or foot
• Pain that changes with sitting, bending, coughing, or sneezing
• Weakness, such as trouble lifting the front of the foot

Where symptoms land can hint at which nerve root is involved, but patterns overlap from person to person.

What a Careful Exam Looks For

Sciatica is mainly identified through history and physical exam.³ An exam may include:

• History: when the leg pain began, what eases or worsens it, and any prior episodes
• Nerve tension tests: such as raising the straight leg, to see whether it reproduces leg symptoms
• Neurological screening: muscle strength, reflexes at the knee and ankle, and skin sensation
• Hip and pelvis checks: to look for sources that can mimic sciatica
• Red-flag screening: bladder or bowel changes, saddle numbness, fever, cancer history, or quickly worsening weakness

Is an MRI Needed?

Not always. Guidance for sciatica generally reserves imaging for people with serious warning signs, significant or worsening nerve problems, or when procedures are being considered.³ A provider who has examined you decides whether imaging or nerve testing, such as NCV/EMG, is appropriate. Findings are interpreted together with the exam, because disc changes also appear in people without symptoms.⁵

What People Often Ask About Care

Published guidance generally starts with conservative care, such as staying as active as symptoms allow and guided exercise, with other options considered when needed.³ Recovery varies a great deal from person to person.

At our office, when care is appropriate it may include hands-on care, rehab exercises, and, when your doctor determines it is appropriate, Hill flexion-distraction. Every plan is individual, and we don't promise a specific result or timeline. Learn more on our back pain care page.

⚠️ Call 911 or go to the ER if you have numbness in the groin, buttocks, or inner thighs (saddle area); new loss of bladder or bowel control; weakness in both legs; or weakness in a leg that is quickly getting worse. These can be signs of a serious nerve compression that needs emergency care.

If Leg Pain Started After a Crash or Fall

Leg pain or tingling that starts after a collision or fall deserves an evaluation. See our Bradenton car accident page if a crash was involved.

Frequently Asked Questions

Is sciatica the same as a pinched nerve?
Often, but not always. Sciatica describes pain along the sciatic nerve's path. When it comes from an irritated nerve root in the low back, the clinical term is lumbar radiculopathy, which many people call a pinched nerve.

What causes sciatica?
A disc herniation is the most commonly described cause. Spinal stenosis, spondylolisthesis, and muscle or joint problems near the hip can also cause sciatica or symptoms that feel similar.

Do I need an MRI for sciatica?
Not always. Imaging is generally reserved for serious warning signs, significant or worsening nerve problems, or when procedures are being considered. A provider who has examined you decides.

When is sciatica an emergency?
Call 911 or go to the ER for numbness in the groin or inner thighs, new loss of bladder or bowel control, weakness in both legs, or rapidly worsening leg weakness.

Have Questions?

Our Bradenton team is happy to talk through your questions in plain language. An exam looks at your history, your symptoms, and how you move. It is not a promise of any particular finding, test, or result.

📞 941-877-0317
Bradenton: 3633 Cortez Rd W, Ste A9, Bradenton, FL 34210
Bradenton hours: Monday–Thursday 9:00 AM–12:00 PM and 1:30 PM–6:00 PM; Friday 9:00 AM–12:00 PM

Auto accident patients: walk-ins and same-day evaluations are welcome during office hours at our Bradenton office. For other care, please call 941-877-0317 to schedule.

Se habla español en nuestra oficina de Bradenton.

⚠️ If you think you have a medical emergency, call 911 or go to the nearest emergency room.

Related reading: Back Pain Care · "Pinched Nerve" Pain · Low Back Pain Causes · NCV/EMG Testing · Patient Education

Sources

1. MedlinePlus. Sciatica. https://medlineplus.gov/sciatica.html
2. MedlinePlus Medical Encyclopedia. Sciatica. https://medlineplus.gov/ency/article/000686.htm
3. Jensen RK, Kongsted A, Kjaer P, Koes B. Diagnosis and treatment of sciatica. BMJ. 2019;367:l6273. https://pubmed.ncbi.nlm.nih.gov/31744805/
4. AAOS OrthoInfo. Sciatica. https://orthoinfo.aaos.org/en/diseases--conditions/sciatica/
5. Brinjikji W, et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. AJNR Am J Neuroradiol. 2015;36(4):811–816. https://pubmed.ncbi.nlm.nih.gov/25430861/

This article is for general educational purposes only and isn't medical or legal advice. It doesn't describe any particular patient or case, and it isn't an opinion about any individual. Reading it doesn't create a doctor–patient relationship. If you think you have a medical emergency, call 911 or go to the nearest emergency room.