The Hip-Pain Warning Signs Worth Knowing

Most hip pain is not an emergency

The overwhelming majority of hip pain in adults is degenerative or mechanical rather than urgent — arthritis, tendon irritation, or muscle strain that develops gradually and responds to activity modification, exercise, and time. Hip osteoarthritis alone causes progressive groin and hip pain and stiffness that is common enough to affect a large share of older adults, and its first-line management is nonsurgical 1Ref 1American Academy of Orthopaedic Surgeons (OrthoInfo) (2024).Osteoarthritis of the Hip.Hip osteoarthritis causes progressive groin/hip pain and stiffness, with nonsurgical measures as initial management — cited here for the common, non-urgent baseline.. Arthritis broadly is common: roughly a quarter of US adults report a doctor-diagnosed form of it 2Ref 2Theis KA, Murphy LB, Guglielmo D, et al. (CDC/MMWR) (2021).Prevalence of Arthritis and Arthritis-Attributable Activity Limitation — United States, 2016-2018.About 58.5 million US adults (23.7%) had doctor-diagnosed arthritis in 2016-2018 — cited here for how common non-urgent hip pain is., and it is the most common joint disease overall, driven by cartilage breakdown that becomes more likely with age 3Ref 3National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) (2023).Osteoarthritis.Osteoarthritis is the most common form of arthritis, a degenerative joint disease with cartilage breakdown, more common with age — cited here to contrast ordinary arthritis with the urgent patterns..

the great majority of hip pain, even when it is significant and disruptive, is degenerative or mechanical rather than dangerous.

That baseline matters because it is the backdrop the following warning signs stand out against. None of them describe ordinary stiffness, ordinary soreness after activity, or gradually worsening arthritis pain — they describe a different, faster-moving kind of problem.

Fracture: pain after a fall that won't bear weight

A hip fracture is the clearest hip-pain emergency in older adults, and it has a recognizable signature: pain following a fall or direct trauma, an inability to bear weight on the leg, and sometimes a leg that looks visibly shortened or turned outward while lying down. This pattern warrants same-day evaluation, typically in an emergency department, because a fracture will not settle with rest and delaying care worsens outcomes and complicates treatment.

The key distinguishing feature from ordinary hip pain is the mechanism and the inability to walk on it — an arthritic hip is usually painful but still bears some weight, while a fractured hip generally will not. Any fall in an older adult followed by hip or groin pain and difficulty walking deserves prompt evaluation rather than a wait-and-see approach.

Infection: fever with a hot, swollen joint

A joint infection, or septic arthritis, is a true emergency because untreated infection can destroy the joint within days. The signature is fever or feeling generally unwell alongside a hip that is hot, swollen, and often too painful to move at all, sometimes developing rapidly over hours rather than building gradually. It is more likely in people with diabetes, a weakened immune system, a recent joint injection, or a break in the skin near the joint, though it can occur without any of these.

This is different from the everyday wear-and-tear arthritis that affects many adults gradually over years 3Ref 3National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) (2023).Osteoarthritis.Osteoarthritis is the most common form of arthritis, a degenerative joint disease with cartilage breakdown, more common with age — cited here to contrast ordinary arthritis with the urgent patterns. — septic arthritis announces itself quickly and comes with systemic signs of infection, not just local pain. A hot, swollen, feverish hip needs same-day evaluation, since the diagnosis usually requires sampling the joint fluid directly rather than being made from symptoms alone.

Avascular necrosis: gradual but tied to specific risk factors

Avascular necrosis, sometimes called osteonecrosis, is death of bone tissue in the hip from an interrupted blood supply, and it behaves differently from the two patterns above — it tends to develop over weeks to months rather than announcing itself in hours. The warning signs worth knowing are less about the pain's intensity and more about who is at risk: long-term corticosteroid use, heavy alcohol use, certain blood disorders, major trauma to the hip, or deep-sea diving history are the recognized risk factors, and pain that starts in someone with one of these should not simply be assumed to be ordinary arthritis.

Early avascular necrosis can be difficult to see on a plain X-ray, which is part of why it is worth naming as a distinct possibility rather than folding it into a general arthritis workup when the risk factors are present — an MRI is typically what actually confirms it.

When the pain is really coming from the spine

Hip and buttock pain can also be referred pain from the low back, and when the spine is the true source, the same red-flag logic used for back pain applies. Most individual red-flag signs for spinal fracture or malignancy have a high false-positive rate on their own, but some genuinely raise the odds of something serious — older age, prolonged corticosteroid use, and significant trauma are among the features that push suspicion higher when present with back-region pain 4Ref 4Downie A, Williams CM, Henschke N, et al. (2013).Red flags to screen for malignancy and fracture in patients with low back pain: systematic review.Most individual red flags for spinal fracture/malignancy have high false-positive rates, though some (older age, prolonged corticosteroid use, significant trauma) raise post-test probability — cited here specifically for back-referred hip/buttock pain.. Imaging in the first six weeks is not usually needed for ordinary back pain, but that changes when those specific red flags are present 5Ref 5American Academy of Family Physicians (Choosing Wisely) (2021).Don't do imaging for low back pain within the first six weeks, unless red flags are present.Imaging for low back pain in the first six weeks does not improve outcomes and should be reserved for red-flag cases — cited here specifically for back-referred hip/buttock pain..

Saddle numbness, new loss of bladder or bowel control, or weakness affecting both legs together point to a rare but urgent nerve compression at the base of the spine and need same-day emergency evaluation regardless of how the hip itself feels.

The decision logic in one place

Putting it together: pain after a fall that will not bear weight suggests fracture; fever with a hot, swollen joint suggests infection; gradual pain in someone with steroid use, heavy alcohol use, or major trauma history suggests avascular necrosis; and saddle numbness or bladder or bowel changes suggest a spinal emergency. Outside of these specific patterns, hip pain — even when significant — is far more likely to be arthritis, tendon irritation, or muscle strain, all of which are common and treatable without urgency 1Ref 1American Academy of Orthopaedic Surgeons (OrthoInfo) (2024).Osteoarthritis of the Hip.Hip osteoarthritis causes progressive groin/hip pain and stiffness, with nonsurgical measures as initial management — cited here for the common, non-urgent baseline.2Ref 2Theis KA, Murphy LB, Guglielmo D, et al. (CDC/MMWR) (2021).Prevalence of Arthritis and Arthritis-Attributable Activity Limitation — United States, 2016-2018.About 58.5 million US adults (23.7%) had doctor-diagnosed arthritis in 2016-2018 — cited here for how common non-urgent hip pain is..

Worsening hip pain with a new or increasing limp is its own useful signal even without one of the patterns above, since a limp that is getting steadily worse suggests something is progressing rather than settling, and is worth having assessed rather than waited out. This same triage logic underlies the neck-pain warning signs worth knowing, the back-pain warning signs worth knowing, the knee-pain warning signs worth knowing, the shoulder-pain warning signs worth knowing, hand wrist red flags, and foot ankle red flags — each tuned to that joint's own fracture and infection risks, but built on the same basic idea of matching a specific pattern to a specific concern.