Most hip pain is not an emergency — but some signals are

Hip pain is extremely common, and in the vast majority of cases it has a mechanical or degenerative cause — worn cartilage, muscle strain, or inflammation — that does not need emergency care. Taking a day or two to rest, reaching for an ice pack, or booking a routine GP appointment is the right response for most people.

A minority of presentations are different. The hip is the body's largest weight-bearing joint, and certain conditions affecting it — fracture, joint infection, vascular compromise — can deteriorate rapidly if action is delayed by even a few hours. In those situations, getting the response right, and getting it quickly, materially changes the outcome.

To help patients and families act with the right level of urgency — neither panicking nor waiting too long — the warning signs below are organised into three tiers:

• Emergency: call 999 or go straight to A&E.
• Urgent: contact NHS 111 or request a same-day GP appointment.
• Should not wait: book a GP or specialist review within days, even without emergency features.

Each tier, and the specific signs that belong to it, is explained in turn below.

Call 999 or go to A&E: the hip pain emergencies

Five situations affecting the hip joint demand an immediate 999 call or trip to A&E — do not wait for a GP appointment if any of these apply.

• Unable to bear weight after a fall or injury. If standing or taking a step is impossible, a neck of femur (NOF) fracture must be excluded. NOF fractures worsen rapidly without surgical fixation, and the window for optimal treatment is short.
• Visible deformity of the leg or hip. A leg that appears shorter than the other, is rotated at an odd angle, or a hip joint that looks displaced from its socket points to fracture or dislocation — both require immediate imaging and specialist review.
• Severe hip or groin pain after trauma in an older or osteoporotic patient. This warrants A&E attendance even when pain seems only moderate. Undisplaced NOF fractures can look normal on a plain X-ray; clinical suspicion — not X-ray alone — is what drives the decision to investigate further, and delay increases both morbidity and treatment complexity.
• Numbness, tingling, or sudden loss of sensation in the hip, thigh, or leg alongside acute pain. Acute neurological symptoms alongside hip pain suggest nerve compromise or a fracture pattern affecting adjacent structures.
• Sudden severe pain with leg shortening or rotation in a previously replaced hip. In a patient who has already had a hip replacement, this combination is a prosthetic emergency — periprosthetic fracture or dislocation — and needs urgent orthopaedic assessment.

If any of these features are present, call 999 or go directly to A&E without delay.

Call 111 or your GP today: urgent hip symptoms that cannot wait

Septic arthritis — infection inside the hip joint — can destroy cartilage and bone within hours to days. That single fact is why a hot, swollen, red hip accompanied by fever, chills, or feeling generally unwell needs same-day professional contact, not a period of watchful waiting. Ring NHS 111 or ask your GP for an urgent appointment today.

Septic arthritis is the flagship example of this tier, but several other presentations carry comparable urgency:

• Sudden severe hip pain with no fall or injury. Severe pain starting out of nowhere — particularly if the joint also feels warm or swollen — may indicate avascular necrosis (AVN), in which the blood supply to the femoral head is interrupted, or early-stage septic arthritis before systemic symptoms develop. Neither should be self-managed.
• Hip pain escalating rapidly over 24 to 48 hours without a clear mechanical explanation. Gradual onset over weeks is typical of degenerative conditions; rapid escalation over one or two days is not, and warrants same-day assessment.
• Night sweats, unexplained weight loss, or unusual fatigue alongside persistent hip or groin pain. Primary bone cancer of the hip is rare — it accounts for fewer than one in every hundred cancers — but bone metastasis from a cancer elsewhere is more common and must be excluded promptly. Systemic symptoms alongside bone pain are the signal to act.
• A personal history of cancer with new or worsening hip or thigh bone pain. This combination should prompt urgent referral to exclude skeletal spread, even if the original cancer was treated years ago.
• Skin discolouration (redness or livid bruising) over the hip joint without a clear trauma history is a further red flag listed in NHS guidance as requiring same-day assessment.

For any of these presentations, contact NHS 111 or telephone your GP surgery and ask specifically for a same-day appointment.

Hip pain that should not be left for weeks

Many people tolerate hip pain for far longer than they should — waiting to see whether it settles, managing each day as best they can, and quietly reducing what they do. That patience is understandable, but it has a cost. Conditions such as femoroacetabular impingement (FAI), labral tears, and early-stage hip osteoarthritis are generally more straightforward to manage when identified early rather than after months of compensating and cartilage wear.

The practical threshold is two weeks. Hip pain that has not meaningfully improved after two weeks of sensible home care — rest, over-the-counter analgesia, and reduced loading — warrants a GP or specialist review. Two weeks is not a hard clinical cut-off; it is a reasonable signal that something needs looking at rather than waiting out.

Beyond that rule of thumb, the following patterns should prompt an appointment even without emergency or urgent features:

• Night pain that consistently wakes you from sleep, particularly if there is no previously diagnosed cause for it.
• Pain that limits everyday tasks: getting dressed, walking from the car to a shop, climbing stairs, or sitting through a meal without shifting to find a comfortable position.
• Progressive stiffness or gradual loss of hip range of motion over weeks or months, even when pain remains tolerable.
• Groin, buttock, or referred thigh pain that is not resolving and whose source has not been identified.

None of these presentations is dangerous in itself, but none is something to leave indefinitely. The hip joint responds better to assessment and targeted care than to prolonged avoidance.

Why the timing of a hip diagnosis changes the outcome

The conditions that drive the urgency tiers covered above share one practical characteristic: the window during which they can be treated conservatively — or at all — closes faster than most patients expect. What follows is not a recap of those presentations but a brief account of the specific time-sensitive consequences that explain why the thresholds exist.

Neck of femur fracture and the 36-hour threshold. Surgical repair within 36 hours of admission is associated with substantially lower rates of complications, including pressure injury, chest infection, and venous thromboembolism, and with improved survival in older patients. Each additional day before theatre compounds those risks — which is why this injury cannot be observed at home.

Avascular necrosis (AVN) — the collapsing window for joint preservation. Before the femoral head structurally collapses, procedures such as core decompression may slow or arrest the process and preserve the patient's own hip joint. Once collapse becomes established, those options close and hip replacement becomes the most realistic pathway. The urgency here is not about days but months: catching AVN in its pre-collapse stage materially changes what treatment is possible.

Prosthetic joint infection (PJI). This diagnosis does not appear in the preceding sections. Bacterial infection around a hip replacement implant behaves differently from native joint infection: biofilm forms on implant surfaces, making antibiotic treatment alone largely ineffective. Early identification — before infection becomes chronic — maximises the chance of implant retention through debridement; delayed recognition typically requires full implant removal and a staged revision.

Bone metastases and pathological fracture. Metastatic deposits weaken bone before any fracture occurs. Identifying and staging skeletal disease while the bone cortex remains intact allows protective fixation or targeted radiotherapy; a fracture through tumour-involved bone is a significantly more complex problem to manage surgically and oncologically. Prompt referral is what keeps that scenario preventable.

None of these conditions is common. Together they represent a small minority of hip pain presentations. The reassurance is that all of them can be treated effectively when caught early — which is precisely the purpose of the thresholds above.

What happens when you see a hip specialist

Uncertainty about what a first consultation actually involves keeps many patients waiting longer than they need to. In practice, it is brief and systematic.

A hip specialist begins with a structured history: when the pain started, exactly where it is felt — groin, lateral hip, buttock, or referred into the thigh — what aggravates or relieves it, whether it disturbs sleep, and whether any of the red-flag features covered earlier apply. Red-flag screening typically takes a few minutes and, for most patients, quickly clears the more serious possibilities from the differential.

Physical examination follows: how far the hip moves in each direction, specific impingement tests, whether both legs measure the same length, and how the patient walks. Most tests are brief and do not cause significant discomfort.

Imaging is directed by what the history and examination reveal. A plain X-ray is first line. Where soft-tissue detail matters — suspected labral tear, avascular necrosis, early cartilage changes, or a subtle stress fracture — MRI adds information. Open MRI is a useful alternative for patients who struggle with standard enclosed scanners.

Blood tests are ordered selectively when the clinical picture raises the possibility of infection, inflammatory arthritis, or bone pathology.

Most patients leave the first consultation with a working diagnosis and a clearly mapped next step — not more uncertainty. For patients across Lincolnshire and the surrounding region, Lincolnshire Hip accepts patients directly without a GP referral, as part of the MSK Doctors group, making specialist hip assessment straightforward to access.

1. [1] Hip pain in adults – NHS. https://www.nhs.uk/conditions/hip-pain/ https://www.nhs.uk/conditions/hip-pain/
2. [2] Broken hip (hip fracture) – NHS. https://www.nhs.uk/conditions/hip-fracture/ https://www.nhs.uk/conditions/hip-fracture/