Severe hip pain has dozens possible causes, and the key to narrowing yours down is where exactly you feel it. Pain deep in the groin points to problems inside the hip joint itself. Pain on the outer side of the hip usually involves the tendons or fluid-filled sacs around the joint. And pain that wraps around to the buttock may not originate in the hip at all, but in the lower back or pelvis. Here’s a closer look at the most likely culprits, what each one feels like, and what sets them apart.
Where You Feel It Matters
The hip is a deep ball-and-socket joint surrounded by layers of muscle, tendon, and connective tissue, so “hip pain” can mean very different things depending on the location. Doctors generally divide hip pain into three zones: anterior (groin and front of thigh), lateral (outer hip), and posterior (buttock and back of thigh). Each zone has its own shortlist of likely causes.
Groin pain is the classic sign of a problem inside the joint: arthritis, a labral tear, impingement where the ball and socket don’t fit together smoothly, or, less commonly, a stress fracture in the neck of the thighbone. Lateral pain almost always involves the soft tissues around the bony bump on the outside of your hip. Posterior pain frequently turns out to be referred from the lumbar spine or sacroiliac joint, not from the hip joint at all.
Osteoarthritis: The Most Common Cause
If your hip aches in the groin or front of the thigh and the pain has been creeping up over months or years, osteoarthritis is the leading suspect. The cartilage cushioning the joint wears down, bone rubs against bone, and the body sometimes grows bony spurs along the edges. On an X-ray this shows up as a narrowed joint space.
The pain pattern is fairly distinctive. It tends to flare with activity, especially anything that loads the joint like walking, climbing stairs, or getting out of a chair. Morning stiffness is common but usually loosens within 30 minutes or so. Over time, the pain can start showing up at rest and even wake you at night. You may notice a grinding sensation when you move the hip, difficulty bending to tie your shoes, or a limp that develops as range of motion shrinks. Some people notice their symptoms worsen with rainy weather.
Osteoarthritis can’t be reversed, but staying active with low-impact exercise, maintaining a healthy weight, and working with a physical therapist can keep symptoms manageable for years before a joint replacement becomes necessary.
Outer Hip Pain: Bursitis and Tendon Problems
Pain on the outside of the hip, especially when lying on that side at night, is the hallmark of greater trochanteric pain syndrome. This umbrella term covers irritation of the bursa (a small fluid-filled cushion) and wear or tearing in the tendons of the gluteal muscles that attach near the top of the thighbone.
Common triggers include repetitive motions like running, cycling, or climbing lots of stairs. A fall onto the hip, standing for long stretches, or even lying on one side too long can set it off. Structural factors raise the risk too: scoliosis, a leg-length difference, bone spurs, or lower-back problems that shift your posture and put extra load on one hip. The pain typically worsens when you stand up after sitting, walk upstairs, or press on the outer hip.
Most cases respond well to activity modification, targeted strengthening of the hip muscles, and short-term anti-inflammatory measures. It can take several weeks to settle down, and recurrence is common if the underlying muscle weakness or movement pattern isn’t addressed.
Labral Tears and Impingement
The labrum is a ring of tough cartilage that lines the rim of the hip socket, helping to seal the joint and keep the ball centered. When it tears, you may feel a deep ache in the groin along with a clicking, catching, or locking sensation during certain movements. The pain often flares with pivoting, squatting, or sitting for long periods.
Labral tears frequently go hand in hand with femoroacetabular impingement, a condition where the shape of the ball or socket causes the bones to pinch the labrum during movement. This is especially common in younger, active adults. Diagnosis usually requires an MRI, and treatment ranges from physical therapy and activity changes to arthroscopic surgery for tears that don’t improve.
When Pain Comes From the Spine
One of the trickiest things about hip pain is that it can originate in your lower back. The major nerves serving the hip, including the femoral, sciatic, and obturator nerves, all pass from the lumbar spine through the hip region. Compression or irritation of these nerves at the spine can send pain into the groin, buttock, thigh, or even the knee, closely mimicking a true hip problem.
Clues that your pain is actually coming from the spine include numbness or tingling running down the leg, pain that changes with back position rather than hip position, and symptoms that started around the same time as new back stiffness. Sacroiliac joint dysfunction, where the joint connecting the base of the spine to the pelvis becomes inflamed, is another frequent source of deep buttock pain that patients describe as “hip pain.” This overlap is common enough that doctors have a name for it: hip-spine syndrome.
Avascular Necrosis: A Less Obvious Cause
Avascular necrosis happens when blood flow to the ball of the thighbone is disrupted, causing the bone to slowly die and eventually collapse. Early on there may be no symptoms at all. As it progresses, the hip hurts only when bearing weight. Eventually the pain is constant, even when lying down.
Two of the biggest risk factors are long-term use of high-dose corticosteroids (like prednisone) and heavy alcohol consumption over several years. Corticosteroids may raise fat levels in the blood, reducing circulation to the bone, and the risk appears to increase with repeated courses. If you’ve been on steroids for another condition and your hip starts aching, it’s worth mentioning that medication history to your doctor. Caught early, the bone can sometimes be preserved. Left untreated, the femoral head collapses and a joint replacement becomes the only option.
Hip Fractures in Older Adults
For anyone over 65, especially those with osteoporosis, sudden severe hip pain after a fall (or sometimes even a twist or stumble) raises immediate concern for a fracture. The pain is usually intense, weight-bearing becomes impossible, and the affected leg may appear shorter or rotated outward.
Hip fractures are a medical emergency. While the surgery itself carries a mortality rate of only 1 to 2 percent, the complications that follow, including blood clots, pneumonia, loss of mobility, and difficulty with self-care, push overall one-year mortality to an estimated 20 to 40 percent in older adults. Quick surgical repair and early mobilization dramatically improve outcomes.
Infection: Rare but Urgent
Septic arthritis, a bacterial infection inside the joint, is uncommon but demands immediate treatment. It comes on fast: intense pain, swelling, warmth over the joint, difficulty moving the hip at all, and often a fever. If you have these symptoms together, especially if you’re immunocompromised or recently had a procedure, this needs emergency evaluation. Treatment involves draining infected fluid from the joint and antibiotics.
Sorting Out Your Next Step
Start by pinpointing the location and behavior of your pain. Groin pain that worsens with activity and eases with rest points toward the joint itself. Outer hip pain that flares when lying on that side suggests bursitis or tendon trouble. Buttock pain with tingling down the leg is more likely coming from the spine. A clicking or catching sensation in a younger, active person raises suspicion for a labral tear.
Certain combinations warrant urgent attention: sudden inability to bear weight after a fall, pain with fever and joint swelling, or rapidly worsening pain that doesn’t respond to rest. For everything else, a thorough physical exam and, when needed, imaging can usually identify the source and point toward the right treatment plan.