Sacroiliac joint pain responds well to a combination of targeted stretching, core strengthening, and simple lifestyle adjustments. Most people get significant relief without medical procedures, using over-the-counter anti-inflammatory medication alongside a consistent exercise routine. The key is understanding whether your joint is too stiff or too loose, because the right approach depends on which problem you’re dealing with.
Why Your SI Joint Hurts
Your two sacroiliac joints sit where the base of your spine meets your pelvis, one on each side. They don’t move much, but they absorb enormous force every time you walk, bend, or shift your weight. Pain develops through one of two mechanisms: the joint becomes too stiff (hypomobility) or too loose (hypermobility). When the joint is too stiff, it can’t properly distribute the forces passing between your spine and legs, so surrounding tissues take the hit. When the joint is too loose, excess movement creates shearing forces that irritate the ligaments and joint surfaces.
Pregnancy is one of the most common triggers. Hormonal changes in the third trimester loosen the ligaments around the SI joint to prepare for delivery, and nearly half of all pregnant women develop pelvic girdle pain that includes the SI joint. For most, this resolves after birth, but roughly 8% to 10% of women still have pain one to two years postpartum. Other common causes include falls onto the buttock, repetitive asymmetric activities like running or lunging, prior lumbar spine surgery, and age-related joint degeneration.
Stretches That Target SI Joint Pain
A consistent stretching routine loosens the muscles that pull on the pelvis and create uneven stress across the SI joint. These stretches work best when done daily, not just when pain flares.
Knee-to-chest stretch: Lie on your back and pull one knee toward your chest. Hold for 15 to 30 seconds, then switch sides. Repeat 2 to 4 times per leg. This gently opens the joint on the side you’re pulling and releases tension in the lower back.
Piriformis stretch: The piriformis muscle runs deep in your buttock and connects directly to the sacrum. When it’s tight, it tugs on the SI joint. Lie on your back with both legs straight, then cross one ankle over the opposite knee and gently press the raised knee away from you. Hold 15 to 30 seconds, repeat 2 to 4 times each side.
Hamstring stretch: Tight hamstrings tilt the pelvis backward and load the SI joint unevenly. You can use a doorway (lie on your back with one leg up against the door frame) or loop a towel around your foot while lying down. The doorway method is especially effective because you can hold it longer. Start with at least one minute and work up to six minutes per side. Repeat 2 to 4 times.
Strengthening Exercises for Stability
Stretching alone won’t fix the problem if the muscles around your pelvis aren’t strong enough to keep the joint stable. Core and hip strengthening exercises are essential, particularly for people whose pain comes from a loose or unstable joint.
Bridging: Lie on your back with knees bent and feet flat on the floor. Tighten your abdominals and lift your hips until your body forms a straight line from shoulders to knees. Hold for about 6 seconds, lower slowly, and repeat 8 to 12 times. This strengthens the glutes and deep core muscles that support the pelvis from below.
Bird dog: Start on hands and knees. Extend one arm forward while keeping your core tight, hold for 6 seconds, then switch arms. As you get stronger, work up to holding 10 to 30 seconds. Repeat 8 to 12 times per side. This trains the stabilizing muscles on both sides of your spine to work together.
Clamshell: Lie on your side with knees bent and feet together. Keeping your feet touching, raise your top knee like opening a clamshell. Hold 6 seconds, lower slowly, repeat 8 to 12 times, then switch sides. This targets the outer hip muscles that control pelvic alignment during walking.
Lower abdominal activation: Lie on your back with knees bent. Press your lower back into the floor by tightening your deep abdominal muscles. Slowly lift one foot a few inches off the ground, lower it, then lift the other. Alternate until you’ve lifted each leg 8 to 12 times. This exercise specifically trains the deep core muscles that compress and stabilize the SI joint.
Over-the-Counter Pain Relief
Anti-inflammatory medications like ibuprofen and naproxen sodium are typically the first line of treatment. They reduce both the pain and the inflammation inside the joint. Acetaminophen can help with pain but doesn’t address inflammation. These medications work best as a short-term bridge while your exercise routine builds enough strength and flexibility to manage the pain on its own.
Sleep Adjustments That Help
SI joint pain often worsens overnight because lying in one position for hours can compress or twist the joint. Small changes to your sleeping setup make a noticeable difference. If you sleep on your back, place a pillow under your knees to reduce the arch in your lower back and take pressure off the joints. If you sleep on your side, put a firm pillow between your knees to keep your hips aligned. When pain is mainly on one side, sleep on the opposite side with the pillow in place.
SI Belts and Bracing
A sacroiliac belt is a narrow, rigid band that wraps around your pelvis (not your waist) to compress the SI joints and limit their movement. It’s particularly useful for hypermobility-related pain, including pregnancy-related SI dysfunction. The belt works by providing the external compression that your ligaments aren’t supplying on their own. Many people find it helpful during activities that aggravate symptoms, like walking or standing for long periods, while they build the muscle strength to stabilize the joint without it.
When Exercises Aren’t Enough
If several months of consistent stretching, strengthening, and over-the-counter medication haven’t given you adequate relief, medical procedures become an option. Corticosteroid injections delivered directly into the joint can reduce inflammation and provide weeks to months of relief. They’re also used diagnostically: if an injection into the SI joint eliminates your pain, it confirms the joint is the source. Radiofrequency ablation, which uses heat to interrupt the nerves sending pain signals from the joint, is another option for people who respond to injections but need longer-lasting relief.
Surgery is reserved for cases where everything else has failed. Minimally invasive SI joint fusion is considered appropriate only after at least six months of intensive conservative treatment, including medication, activity modification, bracing, and a targeted exercise program. The procedure fuses the joint to eliminate movement and the pain it causes. It’s a last resort, but for the small percentage of people with severe, treatment-resistant pain, it can be effective.
Matching Your Approach to Your Problem
The most important thing you can do is figure out whether your joint is stiff or unstable, because the strategies differ. If your pain started after prolonged sitting, feels worst first thing in the morning, and improves once you get moving, stiffness is the more likely culprit. Focus on stretching and gentle mobilization. If your pain worsens with activity, feels unstable or “clunky” during walking, or started during pregnancy, instability is more likely. Prioritize strengthening exercises and consider an SI belt during flare-ups.
Either way, consistency matters more than intensity. A 10-minute daily routine of the stretches and exercises above will outperform an aggressive session done once a week. Most people notice meaningful improvement within four to six weeks of daily work, though building the kind of pelvic stability that prevents recurrence takes longer.