Pain isolated to one buttock cheek is usually caused by a muscle, joint, or nerve issue that responds well to targeted stretching, habit changes, and rest. The most common culprits are a tight or irritated piriformis muscle, sacroiliac joint dysfunction, or sciatic nerve compression. Figuring out which one you’re dealing with helps you choose the right approach to relief.
What’s Causing the Pain
The buttock is a busy intersection of deep muscles, joints, and the body’s largest nerve. Pain on one side typically points to one of a few sources, and each feels slightly different.
Piriformis syndrome is one of the most common reasons for one-sided buttock pain, especially if you sit for long periods. The piriformis is a small, deep muscle that runs across the buttock from the base of the spine to the top of the thighbone. When it tightens or spasms, it presses directly on the sciatic nerve. This produces a deep ache in the buttock that can spread numbness or tingling into the hip or upper leg. Injury, overuse, or simply sitting too long can trigger it.
Sciatica from the lower spine can produce similar symptoms but starts higher up. A herniated disc or bone spur in the lumbar spine compresses a nerve root before it joins the sciatic nerve. The pain then travels a predictable path: low back to buttock to the back of the thigh and calf. It often feels like a sharp, burning jolt or electric shock rather than a dull ache. The key difference from piriformis syndrome is that sciatica typically involves noticeable low back pain and can radiate well below the knee.
Sacroiliac (SI) joint dysfunction causes an aching or sharp pain right where the base of the spine meets the pelvis, just below the bony bump you can feel at the top of your buttock. The pain can spread into the buttock itself and sometimes into the groin or upper leg, but it rarely goes past the knee. It also rarely has a burning or tingling quality, which helps distinguish it from nerve-related problems. SI joint pain can come on gradually or after an awkward movement.
Less commonly, a simple muscle strain in the gluteus maximus or medius, or a deep bruise, can cause localized soreness that resolves with basic rest and ice.
Stretches That Target the Right Muscles
If your pain is muscular or piriformis-related, consistent stretching is the single most effective thing you can do at home. Two stretches in particular hit the piriformis and surrounding hip rotators directly.
Seated Figure-Four Stretch
Sit in a chair with both feet flat on the floor. Cross the ankle of your painful side over the opposite knee so your leg forms a figure-four shape. Let the raised knee fall gently downward while keeping your ankle in place. You should feel a deep stretch in the affected buttock. Lean your torso slightly forward to intensify it. Hold for 30 seconds, then repeat two or three times.
Supine Cross-Body Knee Pull
Lie flat on your back with both legs straight. Lift the leg on the painful side and bend the knee. With the opposite hand, pull that knee across your body toward the opposite shoulder. You’ll feel a stretch deep in the buttock. Hold for 30 seconds. This position isolates the piriformis more precisely than most other stretches because it combines hip flexion with internal rotation.
Do these stretches at least twice a day. Many people notice a meaningful reduction in pain within one to two weeks of daily stretching, though severe cases take longer. Avoid bouncing or forcing the stretch into sharp pain.
How to Reduce Pain Throughout the Day
Stretching helps, but it won’t stick if the habits that created the problem continue. Most one-sided buttock pain is aggravated (or caused) by how you sit.
Set your chair height so your hips are slightly higher than your knees. This keeps the pelvis in a neutral position and takes tension off the piriformis and lower back. Add a small lumbar roll or pillow behind your lower back to prevent slouching, which tilts the pelvis and loads the deep hip muscles unevenly. Keep both feet flat on the floor with knees at roughly 90 degrees. Crossing your legs or sitting on one foot shifts your weight onto one buttock and compresses exactly the structures that are already irritated.
If you sit for work, stand and move for at least two minutes every 30 to 45 minutes. Even a brief walk to the kitchen resets the muscle tension that builds in a static position. A firm seat cushion with a coccyx cutout can also redistribute pressure away from the piriformis area.
Ice the painful spot for 15 to 20 minutes at a time during the first few days, especially after activity. Once the sharp phase passes, switching to a heating pad can help relax the muscle and improve blood flow. Over-the-counter anti-inflammatory medication can take the edge off while you work on the underlying tightness.
When the Pain Involves Nerves
If your pain shoots down the back of your leg, feels electric, or comes with numbness or tingling, a nerve is likely involved. For piriformis syndrome, the stretches and sitting changes above are still the first line of treatment because the goal is to get the muscle to release its grip on the nerve.
For sciatica originating in the spine, gentle movement is better than bed rest. Walking, swimming, or other low-impact activity keeps the muscles around the spine from stiffening further. Avoid heavy lifting, deep forward bending, and prolonged sitting until symptoms ease. Most sciatica episodes improve within four to six weeks with conservative care.
If stretching and lifestyle changes don’t provide relief after several weeks, trigger point injections are one medical option. A provider inserts a thin needle into the knotted area of the piriformis muscle, sometimes with a local anesthetic or a small dose of medication to reduce inflammation. The needle is moved rhythmically through the tight band to release it. Many people feel significant improvement after one or two sessions, though the injection works best when combined with an ongoing stretching program.
Strengthening to Prevent Recurrence
Once the acute pain settles, weak glutes are often the reason it came on in the first place. The piriformis compensates when the larger gluteal muscles aren’t doing their job, which overloads it. Adding a few targeted exercises prevents the cycle from repeating.
Clamshells, glute bridges, and lateral band walks strengthen the gluteus medius and maximus without putting excessive stress on the piriformis. Start with bodyweight only and aim for two to three sets of 12 to 15 repetitions, three or four times per week. Increase resistance gradually. Runners, cyclists, and people who sit all day are especially prone to this weakness pattern and benefit most from consistent glute work.
Red Flags That Need Immediate Attention
Rarely, buttock pain signals a serious condition called cauda equina syndrome, where the bundle of nerves at the base of the spinal cord is compressed. Go to an emergency room if you experience any combination of the following: sudden difficulty urinating or having a bowel movement, numbness spreading across both buttocks and the inner thighs (sometimes called saddle numbness), progressive leg weakness, or new incontinence. This is a surgical emergency, and outcomes are significantly better with rapid treatment.