Is It Sciatica? Understanding Leg Pain That Starts in Your Spine

Pain, tingling, or numbness that travels from your lower back or buttock down into your leg often points to the sciatic nerve — but not all leg pain is sciatica, and the difference matters, because the treatments are different. Here’s how to tell what you’re likely dealing with, which symptoms mean you should be seen urgently, and what actually helps. (For the full picture of how we diagnose and treat it, see our sciatica treatment page.)

What sciatica actually is

The sciatic nerve is the largest nerve in your body, formed from nerve roots that exit the lower spine, merging and running through the buttock and down the back of each leg. “Sciatica” isn’t a diagnosis — it’s a symptom: irritation or compression somewhere along that pathway. The felt result is distinctive: pain that travels, often sharp, burning, or electric, frequently with tingling or numbness along its route. The most common sources are a bulging or herniated disc pressing on a nerve root, narrowing of the nerve’s exit passage, or a pinched nerve irritated by joint misalignment and inflammation.

Sciatica vs. other leg pain: how to tell

	Sciatica	Hamstring strain	SI joint dysfunction
Where it’s felt	Travels: low back or buttock down the back of the leg, sometimes to the foot	Local: back of the thigh only	One side of the very low back/upper buttock; may refer to the thigh
What it feels like	Sharp, burning, electric; often tingling or numbness	Dull ache or pulling; tender to touch	Deep ache; feels ‘stuck’ or unstable
What triggers it	Sitting, bending forward, coughing or sneezing	Activity that loads the muscle (running, stretching)	Standing up from sitting, rolling over in bed, stairs
Numbness or tingling?	Common	No	Rare

A useful rule of thumb: pain that shoots past the knee, especially with tingling or numbness, is nerve pain until proven otherwise.

Red flags: when to seek care immediately

• Numbness in the groin or inner thighs (“saddle” area)
• New difficulty controlling bladder or bowels
• Rapidly worsening leg weakness, or a foot that slaps or drags when you walk
• Leg pain with fever, or after significant trauma

These are signs of serious nerve compression and warrant emergency medical evaluation — not a chiropractic appointment, not a wait-and-see week. They’re uncommon, but they’re the reason “just leg pain” deserves respect.

Why rest alone rarely fixes it

Classic advice for sciatica is to rest until it settles. And it often does settle — temporarily. The problem: if a disc or joint problem is compressing the nerve, rest changes nothing about that mechanical situation, and extended rest actually works against you by weakening the muscles that support and unload your spine. This is why sciatica so often returns weeks or months later, a little worse. Movement, done right, is medicine here; the trick is calming the flare first and then correcting the mechanics that caused it.

What actually helps

Care for sciatica runs on a ladder. Conservative care — precise chiropractic adjustment to relieve the mechanical pressure, targeted decompression, and progressive rehab to stabilize the correction — resolves most cases and carries the least risk, which is why major guidelines recommend starting there. Injections can quiet severe inflammation but don’t change the mechanics that caused it. Surgery has a real place for progressive neurological loss or true emergencies — and for everyone else, it’s the last resort, not the first option.

At our Arlington Heights clinic, the difference in our approach is measurement first: digital X-rays and a focused exam to find where along the nerve’s path the compression is happening, because “sciatica” that starts at a disc, a joint, or the pelvis gets three different corrective plans.

When to get it checked

If leg pain has lasted more than a week or two, keeps returning, or comes with any tingling or numbness, it’s earned an evaluation. You’ll leave your first visit knowing what’s actually compressing the nerve and what it takes to fix it — no guesswork, no indefinite “let’s see how it goes.” Request an appointment and let’s find out what’s really causing it.