Pain that runs from the hip all the way down to the ankle almost always involves a nerve, a blood vessel, or a joint sending distress signals far from the actual problem. The most common culprit is irritation of a nerve root in the lower back, but the list of possible causes is surprisingly long and includes problems in the hip joint itself, the sacroiliac joint, the deep buttock muscles, and the leg’s arteries. What makes this kind of widespread leg pain tricky is that the location where you feel it often does not match the location of the problem generating it.
Lumbar Nerve Compression and Sciatica
The single most recognized cause of pain running from the hip region to the ankle is compression or irritation of a nerve root in the lumbar spine. A herniated disc, bone spur, or swollen ligament pressing on the L4, L5, or S1 nerve root can fire pain signals down the entire leg. Clinicians often call this “radiculopathy” or, more casually, sciatica. The sciatic nerve is the largest nerve in the body, formed from several lumbar and sacral nerve roots, and it extends from the low back through the buttock and down the back of the leg to the foot.
One widespread misconception is that the pain should follow a neat, predictable stripe down the leg corresponding to a textbook nerve map. Research tells a different story. In a study of lumbar nerve root pain patterns, the pain did not follow the expected dermatome in roughly two-thirds of cases. The most common referral pattern for the L3 through S1 nerve roots was actually pain in the buttock, the back of the thigh, and the back of the calf, regardless of which specific root was involved.1PubMed. Induced lumbosacral radicular symptom referral patterns: a descriptive study The S1 root was the one exception where the pain more reliably matched the textbook map, following that pattern in about 65% of cases.2PubMed Central. Pain patterns and descriptions in patients with radicular pain: Does the pain necessarily follow a specific dermatome? So if your pain does not neatly trace one line down your leg, that alone does not rule out a spinal nerve problem.
Piriformis Syndrome
Not all sciatic-type pain starts in the spine. The piriformis is a small muscle deep in the buttock that sits right on top of the sciatic nerve. When this muscle goes into spasm, becomes chronically tight, or has an anatomical variation that crowds the nerve, it can compress the sciatic nerve and generate pain that radiates down the back of the leg, closely mimicking a disc herniation.3PubMed Central. Behind the Pain: Understanding and Treating Piriformis Syndrome The key difference is that piriformis syndrome typically produces tenderness deep in the buttock rather than in the lower back, and pain tends to worsen with prolonged sitting or activities that involve hip rotation. It is a frustrating diagnosis because there is no definitive imaging test for it; diagnosis usually relies on clinical examination and ruling out spinal causes.
Sacroiliac Joint Dysfunction
The sacroiliac joint, where the base of the spine meets the pelvis, is another commonly overlooked generator of hip-to-ankle pain. When this joint is inflamed or dysfunctional, it can refer pain well beyond the local area. More than 60% of patients with sacroiliac joint disorders report leg symptoms including both pain and numbness or tingling. Pain tends to concentrate in the buttock, groin, and thigh, while numbness and tingling tend to show up along the side-to-back of the thigh and the back of the calf.4PubMed. Leg symptoms associated with sacroiliac joint disorder and related pain
Half of patients with confirmed sacroiliac joint pain describe pain extending into the leg, and about 28% feel it below the knee. Younger patients are more likely to experience pain that travels farther down the leg toward the foot.5PubMed. Sacroiliac joint pain referral zones Because the referral pattern overlaps so heavily with sciatica and hip joint problems, sacroiliac joint dysfunction is easy to misattribute. Adding to the confusion, different sections of the joint itself produce pain in different parts of the buttock, ranging from the upper buttock near the iliac crest down to the lower buttock depending on which part of the joint is affected.6PubMed. Referred pain location depends on the affected section of the sacroiliac joint
Pain Referred from the Hip Joint Itself
Hip arthritis, labral tears, and other problems inside the hip joint can produce pain far from the hip. This happens because the hip joint shares nerve branches with the knee joint. An anatomical study found that in about 43% of limbs examined, the femoral nerve sent branches to both the hip and the knee from the same nerve bundle.7PubMed. Anatomical study of the articular branches innervated the hip and knee joint with reference to mechanism of referral pain in hip joint disease patients This shared wiring explains why so many people with hip disease feel pain in the front of the knee or the inner thigh rather than, or in addition to, the hip itself.8Journal of Physical Therapy Science. Investigation and Macroscopic Anatomical Study of Referred Pain in Patients with Hip Disease Someone who develops unexplained knee or thigh pain, particularly if it is in the front or inner aspect of the leg, should have their hip evaluated even if the hip does not seem to be the problem.
Peripheral Artery Disease and Vascular Claudication
When blood flow to the legs is restricted by narrowed arteries, the result is a cramping, aching pain that typically comes on with walking and eases with rest. This is peripheral artery disease, and its hallmark symptom, intermittent claudication, can affect the hip, thigh, calf, or all three, depending on where the blockage is. The pain is driven by muscle ischemia, but the story is more complex than a simple plumbing problem. Inflammation, dysfunction in the small blood vessels, and changes in the muscle tissue itself all contribute to how the pain expresses itself.9Circulation Journal. Pathophysiology of Intermittent Claudication in Peripheral Artery Disease
People with peripheral artery disease who also have leg pain at rest, not just with exertion, tend to have worse functional impairment, higher rates of diabetes, and more neuropathy than those whose pain only appears during activity.10JAMA. Leg Symptoms in Peripheral Arterial Disease: Associated Clinical Characteristics and Functional Impairment Vascular claudication is especially worth considering in people over 50 who smoke or have diabetes, heart disease, or high blood pressure, because these are the populations most at risk.
Telling Nerve Pain from Vascular Pain Apart
One of the more common clinical puzzles is distinguishing between neurogenic claudication from spinal stenosis and vascular claudication from artery disease, since both can produce leg pain during walking. The old teaching was that neurogenic pain is above the knee and vascular pain is below it, but research shows that using symptom location alone is unreliable.11PubMed Central. The reliability of differentiating neurogenic claudication from vascular claudication based on symptomatic presentation
Certain clusters of features are more telling. Pain that comes on with standing, gets better when you sit or lean forward (the “shopping cart sign,” where leaning on a cart provides relief), and extends above the knees points more toward spinal stenosis. Pain that eases just by standing still and concentrates below the knees leans toward a vascular cause.11PubMed Central. The reliability of differentiating neurogenic claudication from vascular claudication based on symptomatic presentation Even experienced surgeons occasionally disagree on which type of claudication a patient has when relying on clinical examination alone, and specific physical examination maneuvers have shown poor reliability between different examiners.12PubMed Central. Reliability of the clinical examination in the diagnosis of neurogenic versus vascular claudication If there is any doubt, vascular testing such as an ankle-brachial index is a quick way to screen for artery disease.
Greater Trochanteric Pain Syndrome and the Lateral Chain
Pain along the outside of the leg from the hip to the knee, sometimes reaching lower, can come from a group of conditions collectively called greater trochanteric pain syndrome. This involves the tendons and bursae around the bony prominence on the side of the hip. Patients typically feel pain at the side of the hip that worsens with weight-bearing activities, climbing stairs, or lying on the affected side at night, often with radiation down the outer thigh toward the knee.13PubMed Central. Greater trochanteric pain syndrome: a review of diagnosis and management in general practice
Closely related is iliotibial band syndrome, especially common in runners and cyclists, which affects roughly 7 to 14% of runners. The pain usually centers on the outer knee but can radiate along the entire length of the band, producing hip or thigh pain alongside it.14BMJ. Iliotibial band syndrome Because the pain tracks the lateral side of the leg rather than the back, it sometimes gets missed as a potential cause of hip-to-lower-leg discomfort.
Diabetic Amyotrophy and Other Neuropathies
Diabetes can produce a painful leg condition that looks nothing like the typical “stocking-glove” numbness people associate with diabetic neuropathy. Diabetic amyotrophy, also called diabetic lumbosacral radiculoplexus neuropathy, causes severe pain in the hip, thigh, buttock, and back, followed by progressive weakness in the proximal leg muscles. In a study of 33 patients, about a fifth presented with this condition as their first indication of underlying diabetes. Pain was the most severe symptom at onset in 82% of cases, and it was concentrated in the hip, thigh, buttock, and back in 64%.15PubMed Central. Diabetic amyotrophy, not your typical back pain An unsettling feature of this condition is that it often starts on one side and then progresses to involve the other leg over time.
Deep Vein Thrombosis as a Vascular Emergency
A blood clot in a deep leg vein produces pain, swelling, warmth, and sometimes redness that can stretch from the thigh to the calf. Deep vein thrombosis does not always follow this textbook presentation, though. A large proportion of hospital DVTs are completely asymptomatic, and clinical diagnosis alone is often unreliable.16PubMed. The Diagnosis and Management of Early Deep Vein Thrombosis DVT warrants urgent attention because a clot can break loose and travel to the lungs. Pain from DVT differs from most other causes on this list in that it tends to be constant, worsens with standing or walking, and is accompanied by visible swelling. Sudden onset of calf or thigh pain with swelling, especially after surgery, prolonged immobility, or a long flight, should prompt an immediate medical evaluation.
Myofascial Trigger Points
Sometimes the problem is not a joint, disc, or artery but a tight, irritable knot in a muscle. The gluteus minimus, a small muscle beneath the better-known gluteus medius on the side of the hip, is a common offender. Active trigger points in this muscle can produce a referred pain pattern that closely mimics sciatica, sending pain down the back and side of the leg. A study in patients with subacute sciatica confirmed the presence of active trigger points in the gluteus minimus and found that treating them with dry needling produced significant blood flow changes in the area of referred pain.17PubMed Central. Intensive vasodilatation in the sciatic pain area after dry needling Trigger points are worth considering when imaging of the spine and hip comes back clean but leg pain persists.
Central Sensitization and Why the Pain Lingers
In some people, hip-to-ankle pain develops a life of its own even after the original cause improves. This happens when the nervous system becomes hypersensitive, a process researchers call central sensitization. A study of patients with lumbar radicular pain found that roughly 60% had allodynia, meaning a light touch or mild cooling on the affected leg felt painful. The allodynia often extended all the way into the foot and correlated with the intensity of background pain.18PubMed Central. Tactile allodynia in patients with lumbar radicular pain (sciatica) Central sensitization helps explain why some people continue to hurt long after a disc herniation has healed or after surgery has decompressed a nerve. It also means that addressing the original structural cause may not be enough. Pain that has become centrally maintained sometimes responds better to strategies targeting the nervous system directly, such as graded exercise, desensitization programs, and certain medications that calm overactive pain signaling.
Biomechanical Chain Effects
Even a small structural asymmetry can cascade through the leg and produce pain at multiple levels. A mild leg length discrepancy, for instance, changes the mechanics of the ankle, knee, hip, and pelvis during walking. Research on individuals with knee osteoarthritis found that the shorter limb experienced altered ankle motion, increased loading at the knee, reduced hip forces, and compensatory trunk rotation, essentially stressing the entire lower limb differently from normal.19PubMed. Mild leg length discrepancy affects lower limbs, pelvis and trunk biomechanics of individuals with knee osteoarthritis during gait These compensations can generate pain at multiple sites from hip to ankle without any single joint or nerve being clearly “the problem.” Foot mechanics, pelvic tilt, and muscle imbalances all contribute to this kind of distributed, hard-to-localize pain.
How Clinicians Test for the Cause
The straight leg raise test, where a clinician lifts your extended leg while you lie on your back, is one of the most commonly used physical examination maneuvers for suspected disc herniation. It is a reasonable screening tool but not as reliable as many people assume. Its sensitivity for detecting a disc herniation is moderate at best, around 52% in one study, meaning it misses about half of confirmed herniations. The slump test, which adds a seated forward-bending position, catches more cases with a sensitivity of 84%, though both tests have similar specificity in the low-to-mid 80s.20PubMed. The sensitivity and specificity of the Slump and the Straight Leg Raising tests in patients with lumbar disc herniation
A systematic review of the straight leg raise found that its diagnostic performance varied considerably across studies, and that hamstring tightness or other sources of non-specific pain can trigger false positives, inflating how sensitive the test appears to be.21PubMed. The pain provocation-based straight leg raise test for diagnosis of lumbar disc herniation, lumbar radiculopathy, and/or sciatica: a systematic review of clinical utility In older adults, the test becomes even less reliable, with sensitivity dropping to about 33% in patients over 60.22PubMed Central. The diagnostic accuracy of straight leg raise test in patients more than 60 years of age suffering lumbar disk herniation with low back pain and sciatica This does not mean the test is useless, but it should be one piece of a broader clinical picture, not the deciding factor.
Treatment Depends Heavily on the Cause
Because so many different structures can produce hip-to-ankle pain, there is no single treatment approach. For lumbar disc-related sciatica, the evidence broadly supports starting with conservative measures. A landmark trial comparing early surgery to prolonged conservative care found that both groups reached a 95% probability of perceived recovery after one year, though surgery provided faster initial relief of leg pain.23PubMed. Surgery versus prolonged conservative treatment for sciatica
A meta-analysis of chronic sciatica lasting more than three months found that conservative treatment produced greater reductions in leg pain and improvements in mental and physical health scores compared to surgery, while surgery was more effective for back pain specifically. The authors recommended conservative management as the initial approach unless neurological deficits or a serious condition called cauda equina syndrome was present.24PubMed Central. Surgical vs. Conservative Management of Chronic Sciatica (>3 Months) Due to Lumbar Disc Herniation: Systematic Review and Meta-Analysis A separate network analysis comparing multiple interventions found that disc surgery, epidural injections, non-opioid pain medications, manipulation, and acupuncture all showed statistically significant improvement in overall recovery compared to inactive control, while traction and exercise therapy alone were less effective than injections or surgery.25PubMed. Comparative clinical effectiveness of management strategies for sciatica: systematic review and network meta-analyses
For non-spinal causes, treatment diverges sharply. Piriformis syndrome often responds to targeted stretching, physical therapy, and sometimes injections. Sacroiliac joint dysfunction may improve with manual therapy, stabilization exercises, or joint injections. Peripheral artery disease requires cardiovascular risk management, supervised walking programs, and sometimes surgical revascularization. DVT needs anticoagulation therapy. The broad point is that getting the diagnosis right matters far more than picking the “best” generic treatment for leg pain.
Rare but Serious Causes Worth Knowing About
Tumors in the pelvis or spine can compress the lumbosacral plexus and produce pain that extends from the low back and hip into the thigh and beyond. Pain is often the first and sometimes the only early symptom of a malignant lumbosacral plexopathy, typically unilateral and characteristically worse at night. Over time, weakness develops in about three-quarters of patients, and numbness or tingling in about two-thirds, but the lag between initial pain and these other findings can be weeks or months.26PubMed Central. Pelvic radiculopathies, lumbosacral plexopathies, and neuropathies in oncologic disease: a multidisciplinary approach to a diagnostic challenge Red flags for this kind of cause include unrelenting pain that does not improve with position changes, unexplained weight loss, a history of cancer, and progressive neurological symptoms. Infections of the spine or hip joint can also generate widespread leg pain and warrant urgent investigation when fever, night sweats, or worsening symptoms are present.
Meralgia Paresthetica and Surface Nerve Entrapment
Not all nerve entrapments produce deep, aching sciatic-type pain. The lateral femoral cutaneous nerve is a purely sensory nerve that runs through the groin area and supplies sensation to the outer thigh. When it gets compressed, typically under the inguinal ligament near the hip bone, the result is burning, tingling, or numbness over the outer thigh. This condition, called meralgia paresthetica, can cause significant discomfort and disability, especially when the diagnosis is delayed.27PubMed Central. Meralgia Paresthetica, The Elusive Diagnosis Common triggers include tight belts, weight gain, pregnancy, and prolonged standing. It does not usually reach the ankle, but it is worth mentioning because people experiencing outer-thigh burning alongside other leg symptoms may be dealing with two overlapping problems rather than one continuous condition.