The short answer
Yes. Pain from a pinched nerve in the lower back can be felt at the knee. Pain at the front of the knee or thigh usually comes from the L3 or L4 nerve root; classic sciatica from the sciatic nerve more often travels below the knee into the calf or foot. Clues that it’s your back: the pain travels from the buttock or thigh, affects one leg, comes with numbness or tingling, and the knee isn’t swollen.
Why a back problem can hurt at the knee
Nerves leave the lower spine in pairs and each one supplies a strip of skin and a set of muscles in the leg. When a disc bulge, arthritis or narrowing of the spine presses on one of them, you can feel it anywhere along that nerve’s path, not only where the pressure is.
True sciatica comes from the sciatic nerve, which runs down the back of the thigh. Its pain usually travels below the knee into the calf or foot. Pain at the front of the knee or thigh more often comes from the L3 or L4 nerve roots, higher in the lower back. Many people still call this “sciatica”.
The L4 nerve also controls the knee-jerk reflex, which is one reason a clinician taps your knee when checking a back problem.
Clues the pain is coming from your back
- The pain starts in the low back or buttock, or travels down the leg in a line
- It affects one leg
- You also notice numbness, tingling, burning or a weak knee that buckles
- Sitting, bending forward, coughing or sneezing makes it worse
- The knee itself isn’t swollen, and pressing on the joint doesn’t reproduce the pain
Clues the problem is in the knee
- Swelling, warmth or a knee that looks different from the other one
- Clicking, catching or locking
- Pain with stairs, squatting or kneeling, and tenderness right at the joint
- It started with a twist, a fall or a hit to the knee
Don’t forget the hip
Hip arthritis is a well-known cause of pain felt in the thigh and knee. In one study of people with hip osteoarthritis, 47% had pain below the knee. If your knee hurts but the knee exam is normal, the hip deserves a look too.
How a clinician tells them apart
A first visit is an exam and a conversation. Your clinician checks your reflexes, strength and feeling in each leg, tests how the nerves respond to stretch, and examines the knee and hip directly. Imaging is ordered only when the exam points to it.
The treatment then follows the source. Pain from a pinched nerve is usually treated first with physical therapy, activity changes and medicine guidance, and sometimes an epidural injection. A knee problem has its own options, from therapy to injections. See sciatica and knee pain for what we treat and how.
When to get help
Book a visit if the pain lasts more than a few weeks, keeps coming back, or wakes you at night. Contact a clinician sooner if pain travels below the knee or you notice weakness or numbness in the leg.
Care for this at Specialty Medical Center
This article is general information. It doesn’t diagnose your problem or replace advice from your own clinician.
Sources
- Spine-health (Adaku Nwachuku, DO, physiatrist): Does sciatica cause knee pain?
- StatPearls: Lumbosacral radiculopathy (NIH National Library of Medicine)
- Annals of the Royal College of Surgeons of England (2004): Hip osteoarthritis: where is the pain?
- MedlinePlus Medical Encyclopedia: Sciatica
Keep reading
How to sleep with sciatica
Sciatica often feels worst at night. A few changes to how you lie, and what you do before bed, can make sleep easier.
November 2, 2026 · 3 min read
How long does whiplash last?
Most whiplash gets better within a few weeks. Some injuries take months. What to expect along the way, and when slow recovery means it’s time for an exam.
November 2, 2026 · 3 min read
