Buttock pain most often comes from muscles, tendons, nerves, or joints in and around the gluteal region, not from the buttock tissue itself. The most common culprits are irritated nerves in the lower spine, tight or injured muscles deep in the hip, and dysfunction in the sacroiliac joint where your spine meets your pelvis. Pinpointing the cause matters because treatments vary widely depending on the source.
Sciatica and Nerve Root Irritation
The single most recognized cause of buttock pain is sciatica, a term for pain that radiates along the sciatic nerve. This nerve forms from nerve roots exiting the lower spine (levels L3 through S1) and runs through the buttock, down the back of the thigh, and into the calf. When one of those nerve roots gets compressed or irritated, typically by a herniated disc or a bone spur, the pain often shows up first in the buttock and posterior thigh before traveling further down the leg.
Research published in The Spine Journal found that the buttock, posterior thigh, and posterior calf were the most common areas where symptoms appeared when any nerve root from L3 to S1 was provoked. That means buttock pain can stem from irritation at several different spinal levels, which is one reason imaging or a clinical exam is often needed to locate the exact source. The pain typically feels deep, electric, or shooting, and it usually affects one side. Coughing, sneezing, or sitting for long periods tends to make it worse.
Piriformis Syndrome
The piriformis is a small, flat muscle buried deep in the buttock that runs from the base of the spine to the top of the thighbone. The sciatic nerve passes directly beneath it in most people, but anatomical variations are surprisingly common. In some individuals, part or all of the sciatic nerve actually passes through the piriformis muscle itself, making it more vulnerable to compression.
When the piriformis muscle becomes tight, inflamed, or spasms, it can squeeze the sciatic nerve and produce deep buttock pain that may radiate down the leg. This is piriformis syndrome. It often develops after prolonged sitting, repetitive activities like running, or a direct fall onto the buttock. The hallmark is pain that worsens when you sit on hard surfaces or cross the affected leg over the other knee. Clinicians test for it by flexing and internally rotating the hip. A positive result, meaning it reproduces your pain, has a sensitivity of about 88% and specificity of 83% for identifying the condition.
Deep Gluteal Syndrome
Piriformis syndrome is actually just one piece of a broader problem now called deep gluteal syndrome. This term covers any condition where the sciatic nerve gets trapped or compressed in the space behind the hip joint, and the piriformis is only one possible offender.
Other structures that can pinch the nerve include the obturator internus muscle (another deep hip rotator), the gemelli muscles, and even fibrous bands of tissue that form after injury or surgery. The gemelli-obturator internus syndrome, for instance, occurs when the obturator internus muscle is stretched or abnormally shaped, sometimes combined with a fibrous band that physically constricts the nerve. Hamstring injuries, including partial tendon tears or avulsions near the sit bone, can also contribute to nerve entrapment in this area. Narrowing of the space between the sit bone and the femur, called ischiofemoral impingement, is another cause, usually following trauma or hip surgery.
Deep gluteal syndrome tends to produce symptoms very similar to piriformis syndrome: deep, aching buttock pain that may shoot down the leg, worsened by sitting. The distinction matters because treatment targets the specific structure causing the entrapment.
Sacroiliac Joint Dysfunction
The sacroiliac (SI) joint sits at the back of your pelvis where the triangular bone at the base of your spine (the sacrum) connects to each hip bone. It doesn’t move much, but when it becomes inflamed or shifts slightly out of alignment, it produces a distinctive pain pattern: a deep ache right at the base of the spine on one side, often spreading into the upper buttock.
One simple indicator is the Fortin finger test, where a person is asked to point with one finger to the exact spot that hurts. When patients consistently point to a location just below and to the side of the lower spine, it strongly suggests SI joint involvement. In a study of 54 consecutive patients, all 16 who tested positive on the Fortin finger test were later confirmed to have SI joint abnormalities through diagnostic injections. SI joint dysfunction commonly develops during pregnancy, after a fall onto one side, or from repetitive asymmetric loading like running on uneven surfaces.
Gluteal Tendon Problems
The tendons connecting your gluteal muscles to your hip and pelvis can break down over time, causing pain that centers in the buttock or outer hip area. Gluteal tendinitis is the earlier, inflammatory stage: repetitive movements create small micro-tears in the tendon, leading to deep pain that generally improves with rest, ice, and compression. If the damage continues without adequate recovery, the tendon tissue can begin to deteriorate structurally, a condition called gluteal tendinopathy.
These tendon problems are especially common in runners, people who stand for long hours, and women over 40. The pain is typically worse when lying on the affected side, climbing stairs, or walking for extended periods. Unlike nerve-related buttock pain, it doesn’t usually shoot down the leg past the knee.
Muscle Strains and Direct Injury
Sometimes the explanation is straightforward. The gluteal muscles are large and powerful, and they can strain just like any other muscle group. A sudden sprint, a heavy deadlift, or an awkward fall can tear muscle fibers and cause localized pain, swelling, and stiffness in the buttock. This type of pain is usually easy to identify because it follows a clear event, feels sore to the touch, and improves steadily over days to weeks with rest.
Prolonged sitting on hard surfaces can also cause ischial bursitis, inflammation of the small fluid-filled sac over the sit bone. This produces a tender, aching pain right where your weight presses against a chair. It’s sometimes called “weaver’s bottom” because it historically affected people who sat on hard benches all day.
Vascular vs. Neurogenic Claudication
If your buttock pain comes on specifically during walking or exercise and stops when you rest, two very different conditions could be responsible. Vascular claudication occurs when narrowed arteries can’t deliver enough blood to the muscles during activity. The pain feels deep, cramping, and predictable: it starts after a consistent amount of walking and resolves within a few minutes of standing still.
Neurogenic claudication (sometimes called pseudoclaudication) produces similar exercise-related buttock and leg pain, but it’s caused by nerve compression in a narrowed spinal canal. The key difference is how you get relief. Vascular claudication improves simply by stopping and standing. Neurogenic claudication improves when you lean forward or sit down, because bending forward opens up space in the spinal canal. People with neurogenic claudication often notice they can walk much farther pushing a shopping cart than walking upright.
Red Flags That Need Emergency Care
Most buttock pain is manageable and resolves with time, but a rare condition called cauda equina syndrome requires immediate emergency treatment. This happens when the bundle of nerves at the base of the spinal cord becomes severely compressed, usually by a large disc herniation. The warning signs go beyond ordinary back or buttock pain:
- Saddle numbness: tingling, burning, or loss of sensation in the inner thighs, buttocks, and groin area
- Bladder or bowel changes: inability to urinate, inability to control urination, or loss of bowel control
- Progressive leg weakness: one or both legs becoming noticeably weaker over hours or days
- Sudden severe low back pain combined with any of the above
Cauda equina syndrome can progress from an incomplete form, where you lose the sensation of needing to urinate, to a complete form involving full retention or incontinence. Without surgical decompression within hours, the nerve damage can become permanent. If you develop numbness across both buttocks combined with any change in bladder or bowel function, go to the emergency room rather than waiting for a scheduled appointment.