Sciatica produces a distinct pattern: pain that starts in your lower back or buttock and shoots down one leg, often reaching below the knee and into the foot. If your leg pain follows that path and feels like a sharp, burning sensation or an electric jolt, there’s a good chance you’re dealing with sciatic nerve irritation. But several other conditions mimic sciatica, so the specific details of your pain matter.
The Classic Pain Pattern
The sciatic nerve is the longest nerve in your body, running from your lower spine through your buttock and down the back of each leg. When something compresses or irritates it near the spine, pain typically follows a predictable route: from the low back to the buttock, then down the back of the thigh and calf. It almost always affects just one side.
The sensation varies. Some people feel a deep, burning ache. Others describe sharp jolts or electric shocks that travel the length of the leg. Numbness, tingling, or muscle weakness in the affected leg or foot are also common. You might notice that your foot feels “asleep” or that your toes tingle. Which part of the leg goes numb depends on exactly where the nerve is being compressed. Irritation higher up tends to affect the front of the shin and the inner foot, including the big toe. Compression lower in the spine more commonly causes symptoms along the back of the calf and the outer edge of the foot.
One hallmark of sciatica is that the leg symptoms are often worse than the back pain itself. If your back hurts but the pain doesn’t travel past your buttock, the problem is less likely to be true sciatica.
What Makes It Worse
Sciatica caused by a disc problem in the spine tends to flare with specific movements: bending forward, prolonged standing, or anything that increases pressure inside the spinal canal. Sneezing, coughing, and straining on the toilet can all send a spike of pain down the leg because they momentarily increase pressure around the compressed nerve root.
Sitting for long stretches is a common trigger, but so is transitioning between positions, like going from sitting to standing. Lifting heavy objects, squatting, and twisting at the torso are particularly aggravating. High-impact activities like running and jumping stress the hips and pelvis, which can worsen symptoms. Even stretching your hamstrings aggressively can pull on the nerve and intensify the pain.
Two Simple Tests You Can Try at Home
No home test replaces a professional evaluation, but two checks can give you useful information before you see someone.
Straight Leg Raise
Lie flat on your back on a firm surface. Keep the affected leg straight and slowly raise it toward the ceiling. If this reproduces your familiar shooting leg pain before your leg reaches about 70 degrees (roughly two-thirds of the way to vertical), that’s a positive result. The test picks up about 75% of true sciatica cases, so a negative result doesn’t rule it out, but a positive one is a meaningful signal.
Slump Test
Sit on the edge of a chair or bed with your hands behind your back and your spine upright. Slump forward, rounding your upper and lower back. Then tuck your chin to your chest. From this position, slowly straighten the knee on the affected side. If that alone doesn’t reproduce your pain, pull your toes up toward your shin. If any of these steps triggers your recognizable leg pain and you can’t fully straighten the knee because of it, the test is considered positive. If pulling your toes up causes pain but slightly bending the knee relieves it, that’s another sign the sciatic nerve is involved, because bending the knee takes tension off the nerve.
Sciatica vs. Piriformis Syndrome
Piriformis syndrome is the most common sciatica lookalike. The piriformis is a small muscle deep in the buttock, and the sciatic nerve runs right next to it (or sometimes through it). When the muscle tightens or spasms, it can squeeze the nerve and produce similar symptoms. Here’s how to tell them apart:
- Where pain starts. Piriformis syndrome pain originates deep in the buttock itself. True sciatica starts in the lower back or lumbar spine.
- What makes it worse. Piriformis syndrome flares with hip rotation: sitting for long periods, climbing stairs, getting in and out of a car. True sciatica worsens with spinal movements like bending forward, prolonged standing, or sneezing.
- How far the pain travels. Sciatica frequently radiates all the way down the back of the calf and into the foot. Piriformis syndrome pain usually stays in the buttock and upper thigh and rarely extends below the knee.
- Other neurological signs. True sciatica is more likely to come with numbness, weakness, or reflex changes in the leg. Piriformis syndrome tends to cause localized tenderness and tingling near the hip rather than widespread nerve symptoms.
What a Doctor Actually Checks
If you go in for an evaluation, the exam is straightforward. A clinician will test the strength of specific muscle groups to pinpoint which nerve root is affected. You might be asked to kick out your leg against resistance (testing the nerve root near the L4 vertebra), pull your big toe and foot upward (L5), or push your foot downward like pressing a gas pedal (S1). Walking on your heels tests one nerve root; walking on your toes tests another. The doctor compares both sides, looking for any asymmetry.
Reflex testing follows the same logic. A diminished knee-jerk reflex points to L4 involvement. A reduced ankle reflex suggests S1. These tests, combined with where your numbness and pain are located, help build a picture of exactly which nerve is compressed and how severely.
Imaging isn’t always necessary. Most clinicians start with a physical exam and only order an MRI if symptoms are severe, aren’t improving, or suggest something more serious.
How Long It Typically Lasts
Most sciatica resolves on its own. Research published in the British Medical Journal found that roughly 60% of people with sciatica recover within six weeks using only conservative care: staying active within pain limits, avoiding the specific movements that aggravate it, and using over-the-counter pain relief as needed. For the remaining 40%, recovery can take several more weeks or months, and a smaller subset eventually needs more targeted treatment.
The fact that most cases improve without surgery is worth keeping in mind if you’re in the early weeks and feeling alarmed. Pain that’s gradually getting better, even slowly, is generally on the right track.
Symptoms That Need Immediate Attention
A rare but serious complication called cauda equina syndrome occurs when the bundle of nerves at the base of the spine gets compressed all at once. This is a surgical emergency. The warning signs are distinct from typical sciatica:
- Loss of sensation between the legs, particularly in the area that would contact a saddle
- Bladder or bowel changes, including inability to urinate, loss of control, or not being able to feel when you need to go
- Rapidly worsening weakness in one or both legs
- Severe back pain combined with any of the above
If you develop any combination of these symptoms, go to the emergency department. Cauda equina syndrome requires treatment within hours to prevent permanent nerve damage. Standard sciatica, even when painful, does not carry this level of urgency.