Sciatica vs Referred Pain: What's the Difference — and Why Does It Matter?
Low back pain and leg pain are among the most common reasons patients come to see me as an Osteopath. If you've been through it yourself, you'll know how debilitating sciatica can be — it can take over your life. Your work suffers. Your sleep suffers. The things you enjoy become things you dread. What’s more frustrating and often made worse is the fact it can be hard to differentiate the source and nobody has clearly explained what is actually happening.
What is worth clearing up properly is the difference between referred pain and true nerve pain (which most people call "sciatica"). They can feel similar, but they're not the same, and treating them effectively depends on understanding the distinction.
Simple Low Back Pain (Nociceptive Pain)
Let's start at the beginning. When people have straightforward low back pain — without any leg symptoms — this is typically what's called nociceptive pain. It originates from a structure in the back itself: a muscle, a joint (like the sacroiliac joint or a facet joint), or a ligament. It tends to feel dull and achy and it stays local to the back.
This type of pain can range from mildly irritating to genuinely debilitating — but it stays in the back.
Referred Pain (Somatic Referred Pain)
When that same kind of irritation — from a muscle, joint or ligament — starts to generate pain that travels beyond the back, that's called somatic referred pain. It doesn't mean there's a nerve being trapped or compressed. Instead, the pain spreads in a diffuse, poorly-defined way — often described as a dull gnawing, or an expanding pressure — into the buttock or thigh.
Crucially, referred pain doesn't usually travel below the knee, though in some cases it can extend as far as the foot. It tends to be harder to pinpoint and less sharp or defined than nerve pain.
Radicular Pain — True "Sciatica"
Radicular pain is a different beast altogether. This is the type of pain most people are describing when they say "sciatica." It originates from irritation or compression of a nerve root in the spine — typically from a disc bulge, disc herniation, or narrowing around the nerve.
The hallmark is a sharp, shooting or electrical-shock-like pain that travels from the lower back down the leg — in a relatively narrow band, usually no more than two to three inches wide. It follows a specific nerve pathway, which is why it can be so precisely located.
Radiculopathy — When the Nerve Is Affected More Deeply
Radiculopathy is a step further. This is where the nerve is affected enough that it starts to lose function — not just producing pain, but causing changes in sensation or muscle strength.
Signs of radiculopathy include:
Pins and needles or numbness in a specific part of the leg or foot (following what's called a dermatome — a mapped area of skin supplied by a particular nerve root)
Muscle weakness in the leg or foot (following a myotome — a group of muscles supplied by a particular nerve root)
A well-known example is foot drop, which can occur with L4-5 nerve root involvement. The foot loses the ability to lift properly when walking, causing it to slap down with each step. Patients often compensate by lifting the whole leg higher — something that becomes apparent immediately in how they walk.
Radiculopathy can occur alongside radicular pain, or in some cases with very little pain at all. It's one of the reasons a thorough assessment matters so much.
Red Flags — When to Seek Urgent Help
Whenever someone presents with leg pain or neurological symptoms, it's important to screen for red flags. These are signs that something more serious may be going on and requires urgent medical attention.
These include:
A history of cancer
Unexplained fever or feeling systemically unwell (which may suggest an infection in the spine)
Signs of cauda equina syndrome — a medical emergency
Cauda equina syndrome occurs when there is significant compression of the bundle of nerves at the base of the spine. Symptoms include:
Altered sensation around the perineum, genitals or inner thighs (saddle anaesthesia)
Difficulty urinating or an inability to tell when the bladder is full
Urinary or faecal incontinence
Leg pain or weakness affecting both sides
If you experience any of these symptoms — particularly in combination with back or leg pain — go straight to A&E. This cannot wait for a GP or osteopath appointment.
So What About "Sciatica"?
The term "sciatica" is still widely used by patients — and understandably so. But clinically, it's a fairly imprecise label. What we're really interested in is why you have leg pain: is it referred from a joint or muscle? Is it coming from a compressed nerve root? Is there evidence of neurological deficit?
The answer shapes the assessment, the diagnosis, and the treatment plan.
What This Means for You
If you're experiencing back pain with leg symptoms — whether that's a vague ache into the buttock, a shooting pain down the leg, or pins and needles in the foot — it's worth getting a proper assessment. These presentations respond well to osteopathic care in many cases, but the approach differs depending on exactly what's going on.
If you're unsure whether your symptoms need an osteopath, a GP, or urgent care, feel free to get in touch and I can point you in the right direction.