Running Sacroiliac Joint Pain: Why It Flares and What Helps

Running sacroiliac joint pain is an ache low on one side of the back that grows as the kilometers add up. The sacroiliac joint (SI joint for short) joins the bottom of your spine to the pelvis. You have one on each side, and you can often find the area as a dimple just above the buttock. In running, the SI joint takes a lot of repeated load. Back pain in general is very common, and the WHO notes that about 90% of cases have no single identifiable cause (WHO, 2023). That is part of why SI pain can be hard to pin down.

Why running sacroiliac joint pain happens

Running is a series of small hops from one leg to the other. In every stride, your whole body lands on a single leg. The pelvis has to pass that impact between the leg and the spine, and it does this thousands of times in a run.

The SI joint is not built for big movement. It moves only a little, and the strong ligaments around it hold it steady. That works well most of the time. When the load rises faster than your body is used to, the area can become irritated and sore.

Pain here is a signal, not a verdict. It tells you that something about the load, the pace or the way you share the movement is asking for attention. That is useful information, and it is worth meeting with curiosity.

What tends to set off a flare

Runners often link their SI joint pain to a handful of familiar things. None of them is a rule, but they are worth noticing.

• A sudden jump in distance or speed. The body adapts best to gradual change.
• Hills. Climbing and descending change how the pelvis tilts and how hard each landing is.
• Cambered roads. A sloped road keeps one leg lower than the other for a long time.
• Overstriding. Long steps land the foot far ahead of you, and the impact travels up to the pelvis.
• Fatigue late in a run. When the muscles tire, the pelvis may take more of the work.
• Stiffness in the hips or upper back. If they move less, the pelvis often moves more to make up the difference.
• A past fall or pregnancy. Some runners find the area stays sensitive afterward. We mention this only to say it is common.

You may recognise one or two of these. Often it is a small mix rather than one cause.

What can help while it settles

Many runners find that the load matters more than any single trick. These changes are widely used and gentle:

• Ease your volume for a while. A few shorter, easier runs often feel kinder than your usual routine.
• Choose flatter, softer routes. Level paths and trails take the edge off each landing.
• Try shorter steps. Landing closer under your body can soften impact.
• Add walk breaks. A few minutes of walking lets the pelvis rest and then keep going.
• Mix in other movement. Swimming or cycling can keep you active while the joint settles.
• Notice the next morning. How you feel the following day tells you more than the run itself.

If your plan needs detail, a sports physiotherapist can build one around you. We also cover the wider picture in how to prevent lower back pain while running.

A Feldenkrais® view: the pelvis, ribs and arms turn together

In the Feldenkrais Method®, we look at how the whole body takes part in a movement. Running is a good example. With each step, your pelvis turns a little one way while your ribs and arms turn the other way. This gentle twist travels up the spine, and it can be shared among many parts.

When the ribs and arms join in, the low back and pelvis do less of the work alone. When they hold still, the pelvis often does more. You do not have to push this. You can simply become curious about it.

Try it while walking, since the pattern is the same at a gentler pace. Walk slowly and let your arms swing without making them. Can you feel your ribs turning a little as each arm moves forward? Can you sense your pelvis turning the other way? Stay with it for a minute. Then notice whether the step feels any lighter.

This is the kind of attention Awareness Through Movement® invites. You are not correcting anything. You are learning how the parts already work together, so you have more choices. For more on how this fits with training, read our Feldypedia pieces on chronic lower back pain and athletes and movement efficiency.

When to see a professional about SI joint pain

SI joint pain can overlap with other problems, such as a disc, the hip, a stress fracture or a nerve. A doctor or sports physiotherapist can tell them apart. See one if:

• the pain began after a fall or a clear injury
• it has not eased after a few weeks
• it gets worse as you run, or makes you limp

Stop running and get checked if you notice pain at rest or at night, pain in the groin, numbness, or weakness in a leg. Gentle movement sits alongside that care. It does not replace it.

Keep reading and keep moving

If you would like a calm way to build body awareness, start with somatic exercises for beginners. To see how the approach compares for runners, read Feldenkrais for runners. If walking is part of your plan, is walking good for SI joint pain looks at that in detail. You can also try the approach with a guide, since Feldy offers a free 7 day trial, and see more on our body awareness page.

Find where to start

Every runner brings a different body and a different week. A short quiz can point you toward a style of movement worth trying.

Curious which movement method could suit you? Try the 60-second Movement Match quiz for three questions and a matched method for a runner with a touchy pelvis.

Common Questions about running sacroiliac joint pain (FAQ)

Should I keep running with SI joint pain?

It depends on how the pain behaves. Many runners cut back for a while and choose gentler runs rather than stopping fully. If the pain gets sharper as you run, makes you limp, or lingers into the evening, pause and ask a doctor or sports physiotherapist. Pain at rest or at night is a reason to get checked first.

How often should I run while my SI joint settles?

There is no number that suits everyone. Many runners find that fewer, shorter, flatter runs with walk breaks feel kinder than their usual routine. Notice how the joint feels that evening and the next morning, and let that guide you. A sports physiotherapist can help you plan around your own body.

How long does running sacroiliac joint pain take to ease?

Nobody can promise a timeline. Some flares settle over a few weeks once the load changes, and others take longer. If the pain is not easing after a few weeks, or it keeps coming back, ask a professional to take a closer look.

How is SI joint pain different from sciatica or hip pain?

SI joint pain tends to sit low on one side of the back, around the dimple above the buttock. Sciatica tends to travel down the back of the leg and may bring tingling or numbness. Hip pain is more often felt in the groin or the side of the hip. The areas overlap, so a professional is the best person to sort them out.

Does stretching help SI joint pain from running?

Some people feel better after gentle lengthening, and others find that pulling hard on a sore area irritates it. Slow awareness movements, where you sense how the pelvis, ribs and legs share a movement, ask for less force. Keep everything well within comfort and skip anything that wakes the pain.

When should I see a professional about running sacroiliac joint pain?

See a doctor or sports physiotherapist if the pain began with a fall, has not eased after a few weeks, or follows you into rest. Get checked promptly for night pain, groin pain, numbness or weakness in a leg. Gentle movement sits alongside medical care and does not replace it.