What Causes Sciatica Pain? The Real Reasons Your Back and Legs Are Hurting

You bend to pick up a laundry basket, and suddenly a sharp, shooting pain races from your lower back down the back of your leg. Maybe it burns. Maybe it tingles. Maybe your foot even feels a little numb. If that sounds familiar, you might be dealing with sciatica, and understanding what’s really behind it is the first step to feeling better.

Jump to a sectionIn this article10 sections

1. What Is Sciatica, Really?
2. What Causes Sciatica Pain? The Real Culprits
3. Common Causes at a Glance
4. Risk Factors: What Makes Sciatica More Likely?
5. Sciatica vs. Ordinary Back Pain: How to Tell the Difference
6. When to See a Doctor Right Away
7. Actionable Tips for Managing and Preventing Sciatica
8. Frequently Asked Questions
9. You Can Get Ahead of Sciatica Pain
10. Sources

What Is Sciatica, Really?

Let’s clear up a common mix-up first. Sciatica is not a condition you “catch” or a single injury. It’s a set of symptoms caused by pressure or irritation on your sciatic nerve: the thick nerve that starts in your lower back, runs through each hip and buttock, and travels all the way down each leg.

When something pinches or inflames that nerve, you feel it along its path. That’s why sciatica pain rarely stays in one spot. It radiates: meaning it spreads from your back down through your leg, sometimes all the way to your foot.

Here’s a helpful way to think about it: the sciatic nerve is like a long electrical cable. When part of that cable gets squeezed or irritated, the whole line downstream can spark, tingle, or ache. So the pain you feel in your leg often starts from a problem in your lower back.

What Causes Sciatica Pain? The Real Culprits

So what’s actually pressing on that nerve? Most of the time, the trouble starts in your spine. Let’s walk through the real reasons your back and legs might be hurting.

1. A Herniated (Slipped) Disc

This is the number-one cause. Between the bones of your spine sit soft, cushiony pads called discs. Think of them like jelly-filled donuts that absorb shock as you move.

Over time, or after a sudden strain, a disc can bulge or tear, letting the soft inside push out. This is a herniated disc (sometimes called a slipped disc). When that bulge presses on a nearby nerve root, it can set off classic sciatica pain.

2. Spinal Stenosis

As we age, the open spaces inside the spine can slowly narrow. This narrowing is called spinal stenosis. When there’s less room, the nerves passing through can get squeezed. This cause is more common in adults over 60, and the pain often feels worse when standing or walking.

3. Bone Spurs and Degenerative Changes

Ever heard someone blame “wear and tear” for their back pain? There’s truth to it. Over the years, the discs and joints in your spine can break down: a process called degeneration. This can lead to bone spurs (small, bony overgrowths) that crowd the nerve and trigger sciatica.

4. Spondylolisthesis

This one has a big name, but the idea is simple. Spondylolisthesis happens when one of the bones in your spine slips slightly forward over the one below it. That shift can pinch the sciatic nerve root and cause radiating pain.

5. Piriformis Syndrome

Here’s a less common one. The piriformis is a small muscle deep in your buttock, and the sciatic nerve runs right beneath it. If that muscle tightens or spasms, it may irritate the nerve and create sciatica-like symptoms. This cause is real but debated, and it’s diagnosed less often than the spine-related causes above.

Rare but Serious Causes

Occasionally, sciatica comes from something more serious, like a tumor, an infection, or a spinal condition that needs urgent care. These are uncommon, but they’re part of why any lasting or severe pain deserves a proper check-up.

Common Causes at a Glance

Sometimes it helps to see it all in one place. Here’s a quick comparison of the main causes and who they tend to affect.

Cause	What’s Happening	Most Common In
Herniated disc	Disc bulges and presses on the nerve	Adults 30 to 50
Spinal stenosis	Spinal canal narrows and squeezes nerves	Adults 60+
Bone spurs / degeneration	“Wear and tear” crowds the nerve	Older adults
Spondylolisthesis	A spine bone slips forward	Varies by age
Piriformis syndrome	A buttock muscle irritates the nerve	Active adults

Notice a pattern? Most cases trace back to nerve compression in the lower spine. That’s the common thread tying nearly all of these together.

Risk Factors: What Makes Sciatica More Likely?

Why do some people get sciatica while others never do? A mix of factors plays a role, and knowing them helps you understand your own risk.

Factors You Can’t Control

• Age. The natural changes in your discs and spine over time make sciatica more likely as you get older.
• Past injuries. A previous back injury can leave you more prone to nerve problems later.
• Genetics. Some people are simply built with spines that are more vulnerable to disc issues.

Factors You Can Influence

• Your job and daily movements. Work that involves heavy lifting, twisting, or long hours of sitting can raise your risk.
• A sedentary lifestyle. Weak core and back muscles offer less support for your spine.
• Extra weight. Carrying more body weight adds stress to your lower back.
• Smoking. It can weaken disc tissue over time and slow healing.
• Poorly managed diabetes. High blood sugar over time can affect nerve health.

Can you erase every risk factor? No. But can you improve several of them? Absolutely, and that’s where your power lies.

Sciatica vs. Ordinary Back Pain: How to Tell the Difference

Not every backache is sciatica. So how do you know which one you’re dealing with? The biggest clue is where the pain goes.

Regular lower back pain usually stays in your back or spreads a little to your hips. Sciatica, on the other hand, shoots down your leg, often past the knee. It may come with tingling, numbness, or a burning, electric feeling, and it typically affects only one side.

If your pain follows that leg-traveling pattern, there’s a good chance a nerve is involved.

When to See a Doctor Right Away

Most sciatica gets better with time and gentle care. But a few symptoms are not the “wait and see” kind. Get medical help promptly if you notice:

• Loss of bladder or bowel control
• Sudden, severe weakness or numbness in your leg
• Numbness around your inner thighs, groin, or buttocks (the “saddle” area)
• Pain following a serious fall or accident
• Back pain with fever or unexplained weight loss

These can signal a rare but serious condition, so don’t tough them out. When in doubt, get checked out.

Actionable Tips for Managing and Preventing Sciatica

Ready to be proactive? While you should always work with a professional for a personal plan, these gentle, everyday habits support a healthier back.

From my coaching: When someone has had sciatica before, I don’t drop leg and back work from their program. I build hip and core strength back up slowly instead. Gentle, regular movement nearly always does better than resting until the pain is gone, as long as their doctor has ruled out anything serious.

• Keep moving. Long bed rest can actually make sciatica worse. Gentle movement and short walks often help more than staying still.
• Mind your posture. When sitting, keep your feet flat and your lower back supported. Avoid slumping for hours.
• Lift with your legs, not your back. Bend your knees, keep the load close to your body, and avoid twisting as you lift.
• Strengthen your core. Strong stomach and back muscles act like a natural brace for your spine.
• Take sitting breaks. If you work at a desk, stand up and stretch every 30 to 60 minutes.
• Stay at a healthy weight. Less pressure on your lower back means less strain on those nerves.
• Apply heat or cold. Many people find short sessions of ice or a warm pack ease flare-ups.
• Don’t ignore lasting pain. If it sticks around for weeks or keeps returning, it’s time to see a professional.

Small, steady habits like these can make a real difference, both in easing current pain and lowering your chances of another flare.

Hips and lower body feeling stiff from long days of sitting? Join my free 5-Day Hip Reset for Women: one short email a day with a simple hip self-check, gentle mobility, the hip hinge, side-hip support for easier walking and a 10-minute daily routine. At home with a chair, a towel, a wall and a broom handle. If you have a recent injury or surgery, a hip replacement, or pain spreading down your leg with numbness or weakness, check with your doctor or a physical therapist first.

Frequently Asked Questions

You Can Get Ahead of Sciatica Pain

Here’s the reassuring truth: sciatica pain can feel scary and frustrating, but for most people, it’s temporary and treatable. Once you understand what causes sciatica, usually a nerve getting pinched somewhere in your lower back, the path forward feels a lot less mysterious.

You may not control every risk factor, but you hold real power over how you move, sit, lift, and care for your body each day. Be patient with yourself, listen to what your back is telling you, and take those small steps toward relief. Your body wants to heal, sometimes it just needs you to give it the right support.

Sources

These are the references behind the main facts in this article, if you want to read further:

• MedlinePlus: Sciatica
• MedlinePlus: Herniated Disk
• MedlinePlus: Spinal Stenosis
• NIAMS: Back Pain

This article is for general education and isn’t medical advice. I’m a NASM-certified personal trainer and NESTA nutrition coach, not a physician or physical therapist. If you have sciatica symptoms, a diagnosed back condition, or a recent injury, check with your doctor or physical therapist before starting new exercises or stretches.

Get emergency care right away for numbness in the groin or inner thighs, new loss of bladder or bowel control, or leg weakness that is getting worse. See a doctor promptly for pain after a fall or injury, or pain with fever or unexplained weight loss. This article is not a substitute for personal care.

Keep going: this article is part of my natural healing and healthy living guide. For every guide, free tool, and honest review, organized by where you are stuck, visit the Posture & Back Pain Hub.