Hip pain has dozens of possible causes, and the most likely one depends heavily on where exactly you feel it, your age, and your activity level. The hip is the body’s largest ball-and-socket joint, surrounded by layers of muscle, tendon, and fluid-filled sacs that can all become sources of pain. Roughly one in five Americans over 55 has hip osteoarthritis alone, making it just one piece of a much larger picture.
Where You Feel It Narrows the Cause
Hip pain isn’t one problem. It’s a symptom that can originate from the joint itself, the surrounding soft tissue, the lower spine, or even the abdomen. The single most useful clue is location: front, side, or back of the hip.
Pain in the front of the hip or groin usually points to something inside the joint. In younger adults, that often means a structural mismatch in how the ball and socket fit together, a torn ring of cartilage lining the socket (called the labrum), or a stress fracture from overuse. In older adults, osteoarthritis is the most common cause of anterior hip pain.
Pain on the outer hip is most often caused by irritation of the soft tissues around the bony prominence on the side of your thigh. This includes inflammation of the fluid-filled sac (bursa) that cushions the area, wear on the tendons of the muscles that stabilize your pelvis, or friction from a thick band of tissue running down the outside of your leg. The pain tends to flare when walking, sitting for long periods, or lying on that side at night.
Pain in the back of the hip or buttock frequently isn’t coming from the hip joint at all. Lower back problems, including herniated discs and spinal narrowing, commonly send pain into the buttock and down the leg. Nerve compression deep in the glute muscles, hamstring injuries near the sit bone, and sacroiliac joint dysfunction can all produce posterior hip pain that mimics a true joint problem.
Osteoarthritis: The Most Common Cause After 50
Osteoarthritis is the leading cause of chronic hip pain in older adults. The process involves a gradual loss of the smooth cartilage coating the joint surfaces, combined with reactive bone growth (bone spurs), weakening of the surrounding muscles, and sometimes low-grade inflammation inside the joint. It’s not simply “wear and tear” but rather a failed repair process where cartilage breaks down faster than the body can rebuild it.
Age over 60 is the single strongest risk factor. Men develop hip osteoarthritis more often before age 50, while women surpass them after that. Prevalence in the U.S. is estimated at nearly 20% of adults over 55. Typical symptoms include a deep ache in the groin or front of the thigh, stiffness after sitting, and gradually shrinking range of motion. Morning stiffness that eases within 30 minutes is a hallmark that distinguishes it from inflammatory arthritis, where stiffness lingers longer.
Structural Problems in Younger Adults
Femoroacetabular impingement, or FAI, is one of the most common causes of hip pain in people under 40. It occurs when the shape of the hip bones creates abnormal contact during movement. Over time, this extra pressure can damage the labrum, the ring of fibrous cartilage that deepens the hip socket and helps seal in lubricating fluid.
Labral tears produce a distinctive set of symptoms: a deep ache that feels like it’s coming from bone rather than muscle, clicking or catching with movement, and sharp pain during bending or rotation. The pain often radiates into the groin, lower back, or leg. Athletes in sports that load the hip repeatedly, including hockey, soccer, dance, golf, and gymnastics, face higher risk. Falls and car accidents can also tear the labrum suddenly.
Soft Tissue Causes on the Outer Hip
Greater trochanteric pain syndrome is an umbrella term for the cluster of problems that cause lateral hip pain. It includes bursitis, tendon degeneration in the muscles that hold your pelvis level when you walk, and friction from the iliotibial band sliding over the bony point of the hip. These conditions overlap so often that clinicians now group them together.
The telltale sign is tenderness when you press directly over the bony bump on the outside of your hip. Pain typically worsens when you cross the affected leg inward and eases when you move it outward. Some people also notice a snapping sensation as a tendon catches over the bone during movement. This “snapping hip” is usually painless on its own but can become irritating if it triggers inflammation.
When the Pain Is Actually Coming From Your Back
About half of people with hip osteoarthritis also have low back pain, and distinguishing between the two can be genuinely difficult. Herniated discs and spinal stenosis in the lower lumbar spine compress nerve roots that feed into the sciatic nerve, which passes directly behind the hip joint. The result is pain that feels like it lives in the hip or buttock but actually originates several inches higher.
A few patterns help separate spine-driven pain from true hip pain. Spine problems tend to produce pain that shoots or radiates down the leg, follows a specific strip of skin, and may come with numbness, tingling, or weakness in the foot or ankle. True hip joint pain is more often felt in the groin, worsens with weight-bearing or rotation, and doesn’t typically travel below the knee. When both sources are active at the same time, a pattern sometimes called “hip-spine syndrome,” sorting out which one to address first becomes a key clinical question.
Bone Death From Lost Blood Supply
Avascular necrosis occurs when blood flow to the head of the femur is disrupted, causing bone cells to die and the joint surface to eventually collapse. It most commonly appears in middle-aged to older adults and tends to progress if untreated. The leading risk factors include prolonged use of high-dose corticosteroids (which cause fatty infiltration of the bone marrow, squeezing out blood vessels), heavy alcohol use, sickle cell disease, hip fractures or dislocations that physically sever blood vessels, and radiation therapy.
Early avascular necrosis often causes no symptoms at all or just a vague groin ache. Standard X-rays can look completely normal in the earliest stages. MRI is the most sensitive tool for catching it early, because it can detect bone swelling and marrow changes before structural damage is visible. Early diagnosis matters because treatment options narrow considerably once the bone surface starts to collapse.
Hip Infections: A True Emergency
Septic arthritis, a bacterial infection inside the joint, is rare but serious. It causes severe pain that comes on rapidly, makes the hip nearly impossible to move, and is often accompanied by fever, swelling, warmth, and skin discoloration over the joint. Unlike most other causes of hip pain, which build gradually, septic arthritis escalates over hours to days. In people with artificial hip joints, infection can appear months or years after surgery, presenting as new pain, looseness in the joint, or difficulty bearing weight. Untreated joint infections can permanently destroy cartilage, so rapid, intense pain in a hip that was recently fine warrants urgent evaluation.
What Happens When Hip Pain Is Treated
Most hip pain responds to nonsurgical approaches. Physical therapy targeting the muscles around the hip, particularly the glute muscles that stabilize the pelvis, is the cornerstone of treatment for soft tissue problems, early arthritis, and many structural issues. Weight management, activity modification, and anti-inflammatory strategies handle a large share of cases.
When osteoarthritis progresses to the point where it significantly limits daily life, total hip replacement is one of the most reliably successful operations in modern medicine. NHS data from over 100,000 procedures shows that 95% of patients report their problems are better after surgery, and 93% rate their results as good, very good, or excellent. Recovery timelines vary, but most people return to low-impact activities within a few months.