Sacroiliac Joint Pain: Symptoms and What Helps

Sacroiliac (SI) joint pain is a common cause of lower back and buttock discomfort that’s frequently mistaken for sciatica, a slipped disc, or a hip problem. The sacroiliac joints anchor the pelvis to the base of the spine, absorbing the forces of walking, bending, and carrying weight. When those joints are irritated or strained, the discomfort can mimic several other conditions closely enough to send patients down the wrong treatment path. This guide explains how SI joint pain presents, how clinicians separate it from similar conditions, and which treatments are most likely to help, in the order care is typically offered.

Sacroiliac Joint Pain Symptoms: What It Feels Like

Sacroiliac joint pain is a dull or aching sensation in one buttock or just below the lower back, arising when one or both SI joints become irritated. The sacroiliac joint connects the sacrum (the triangular bone at the base of the spine) to the ilium (the large upper bone of the pelvis). Most people have two of these joints, one on each side. The discomfort may also travel toward the groin, hip, or upper thigh, and it rarely reaches below the knee without other problems contributing.

Certain everyday movements tend to provoke sacroiliac joint pain. Getting out of a chair, climbing stairs, and turning over in bed are among the most commonly reported triggers. Standing in one position for a long stretch, without shifting weight, lets the ache build gradually. Standing on one leg while putting on shoes often brings it on fast. Some people find the pain is sharpest in the morning and settles as they start moving around.

An AAFP 2022 review identifies SI joint dysfunction as a recognized contributor to low-back pain and notes its presentation overlaps enough with spinal and hip conditions that careful evaluation matters before any treatment begins.

Tip: Keep a brief activity and pain diary for one week. Note which movements bring on the ache and which positions offer relief. This record helps your clinician choose the most useful provocation tests during the examination.

Conditions That Mimic Sacroiliac Joint Pain

Sacroiliac joint pain overlaps in location and character with sciatica, hip arthritis, low back muscle strain, and inflammatory sacroiliitis. Symptom location alone can’t confirm which structure is at fault, so clinicians rely on physical examination, targeted tests, and sometimes imaging to sort these conditions before settling on a treatment path.

Condition	Typical Location	Pain Below the Knee	Common Triggers	Key Distinguisher
SI Joint Pain	Buttock, lower back (one side)	Uncommon	Chair-rising, stairs, turning in bed	Positive provocation cluster; no foot symptoms
Sciatica (Lumbar Radiculopathy)	Buttock, leg	Yes, often to foot	Bending forward, coughing, prolonged sitting	Foot numbness or tingling; nerve exam findings
Hip Arthritis	Groin, outer thigh	Rarely	Walking, squatting, weight-bearing	Pain with hip rotation; X-ray changes
Low Back Muscle Strain	Central or bilateral lower back	No	Lifting, sudden movement, overuse	Improves with rest; both sides often affected
Inflammatory Sacroiliitis	Both buttocks, lower back	Variable	Prolonged rest, sitting still for hours	Morning stiffness over 30 min; eases with activity

Inflammatory sacroiliitis calls for a different treatment path than mechanical SI joint pain because it involves the immune system attacking the joint, not mechanical overload. Mayo Clinic describes conditions such as axial spondyloarthritis as featuring morning stiffness lasting more than 30 minutes, back pain that begins gradually in young adults, and discomfort that improves with physical activity rather than rest. Those features point to inflammatory disease and should trigger a referral to a rheumatologist.

Mechanical SI joint pain, by contrast, typically traces to altered movement patterns, ligament strain, leg-length differences, pregnancy-related pelvic changes, or prior pelvic surgery. Getting that distinction right matters because the two conditions require entirely different management strategies.

How Sacroiliac Joint Pain Is Diagnosed

No single physical examination maneuver can reliably confirm or rule out sacroiliac joint pain on its own. StatPearls on sacroiliac pain, part of the NCBI Bookshelf, notes that clinicians use a cluster of provocation tests instead, hands-on maneuvers designed to stress the SI joint and reproduce the patient’s familiar pain.

Commonly used SI joint provocation tests include the Distraction test, the Compression test, FABER (hip flexion, abduction, and external rotation), the Thigh Thrust, and the Gaenslen test. Three or more of these maneuvers reproducing the patient’s usual pain is taken as a meaningful positive finding. The 2022 AAFP review recommends that cluster approach rather than relying on any single test.

A neurologic examination checks reflexes, sensation, and muscle strength to rule out a pinched nerve in the lumbar spine. A hip range-of-motion check helps exclude hip arthritis as a source of groin or thigh symptoms. Both steps belong in a proper differential workup.

X-rays are most useful when fracture, significant arthritis, or structural disease is suspected. MRI is ordered when infection, malignancy, inflammatory disease, or nerve compression is a concern. But normal imaging doesn’t rule out mechanical SI joint pain, because the joint can function poorly without any structural changes showing on a scan.

An image-guided injection of local anesthetic into the SI joint is used as a confirmatory diagnostic step. If the patient’s familiar pain drops significantly within minutes of the injection, that confirms the SI joint as the main pain source. This local anesthetic block is a separate procedure from the corticosteroid injection considered later in treatment.

How Sacroiliac Joint Pain Is Treated: A Stepwise Plan

Most people with sacroiliac joint pain do well with a staged plan that starts with the safest and most effective steps before moving to more invasive options. The first priority is working out which loads and movements provoke the SI joint, then adjusting them. Evidence suggests prolonged bed rest is unlikely to aid recovery and may worsen deconditioning over time.

Targeted physical therapy sits at the center of conservative SI joint pain care. A therapist assesses how the pelvis and spine move together and designs exercises to build control in the gluteal, hip, and deep abdominal muscles. NIAMS on back pain supports education and active movement as central parts of managing most low-back conditions. Applying heat before activity and ice after can ease short-term discomfort, though neither addresses the underlying movement problem.

Non-steroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen or naproxen, may help selected adults manage sacroiliac joint pain and inflammation. NSAIDs carry risks a doctor will review for each patient: gastrointestinal irritation, kidney strain in older adults, cardiovascular concerns, and interactions with blood thinners or other medications. They’re not suitable during pregnancy. Take them with food and only for as long as a clinician recommends.

A pelvic support belt worn through the day can reduce sacroiliac joint discomfort by giving the pelvis external support, particularly during pregnancy or in the postpartum period. It works best alongside physical therapy, not as a standalone fix. For most people with mechanical SI joint pain, consistent conservative care tends to produce gradual improvement, though timelines vary considerably from person to person. Progress is rarely linear, and short flares during recovery are common. Those who have had symptoms for a longer period before starting treatment generally need more time before seeing sustained gains; a clinician can help set realistic milestones.

Tip: Ask your physical therapist to demonstrate exercises in the clinic before attempting them at home. Exercises that feel comfortable in one position may worsen pain if technique is off, and not every movement listed on a general website suits every patient.

SI Joint Injections, Radiofrequency Ablation, and Surgery

When structured physical therapy and appropriate medications don’t provide lasting relief, interventional procedures such as corticosteroid injections, radiofrequency ablation, and surgical fusion may be considered. Those options work best when the SI joint has been carefully confirmed as the main pain source through clinical evaluation.

A corticosteroid injection, delivered under image guidance directly into the SI joint, may reduce inflammation and give temporary pain relief. When a prior local anesthetic diagnostic block has already pointed to the SI joint as the source, corticosteroid relief at the same site adds further confirmation and informs the next step in care. StatPearls on sacroiliac pain (NCBI Bookshelf) notes that relief from SI joint corticosteroid injections varies and they’re typically not intended as a long-term solution on their own.

Radiofrequency ablation (RFA) uses controlled heat delivered through a needle to interrupt the nerve signals carrying pain from the SI joint. It’s considered for patients with persistent sacroiliac joint pain after thorough conservative care who also showed at least some response to a prior diagnostic injection. Results vary, and the procedure may need to be repeated if pain returns.

Surgical fusion of the SI joint is generally reserved for carefully selected patients with confirmed, persistent mechanical SI joint pain that hasn’t responded to nonsurgical treatment. North American Spine Society guidelines provide a framework for evaluating when spinal-related procedures are appropriate and for whom. Surgery carries significant risks and a recovery period, and it’s not an appropriate path for inflammatory sacroiliitis managed by a rheumatologist.

Sacroiliac Joint Pain During Pregnancy and After Childbirth

Sacroiliac joint pain is especially common during pregnancy and in the months after childbirth. It is widely understood that hormones released to loosen pelvic ligaments ahead of delivery reduce the natural stability of the SI joint, and that ligament laxity shows up as pain with walking, climbing stairs, or carrying a load on one side of the body.

Targeted physiotherapy focusing on pelvic floor, gluteal, and hip stabilizer muscles is the main treatment for pregnancy-related sacroiliac joint pain. A pelvic support belt worn through the day can help by adding external support to the pelvis. NSAIDs are not suitable during pregnancy; discuss all pain-relief options, including topical preparations and acetaminophen (paracetamol), with a midwife or obstetrician before taking anything.

Most pregnancy-related sacroiliac joint pain improves gradually after delivery as hormone levels normalize and pelvic stability returns. If pain persists or worsens in the weeks after childbirth, a clinician familiar with postpartum musculoskeletal conditions should evaluate it. Prolonged SI joint discomfort that goes untreated can chip away at sleep, daily function, and new-parent wellbeing, and tends to respond better to early professional support.

Tip: When getting in and out of a car or bed during pregnancy, keep your knees together and move both legs at the same time. This reduces the asymmetric loading on the SI joint that often triggers pain in that area.

Conclusion

Sacroiliac joint pain is a common but frequently misidentified source of lower back and buttock discomfort, and it does improve for most people with a structured, realistic plan. The clearest starting point is figuring out which activities aggravate the SI joint, then working with a physical therapist to build pelvic and core stability. Medications and other interventions belong later in the sequence, guided by a clinician, not used as a first response.

Inflammatory and mechanical SI joint problems can look similar in early stages yet call for different management strategies. If symptoms include morning stiffness lasting more than 30 minutes, or pain that actually improves with activity rather than rest, tell your doctor. Getting the right specialist involved early changes the trajectory of treatment.

For background on back pain evaluation and when to seek care, the NIAMS on back pain resources are worth reading. If pain has persisted for weeks, is worsening, or comes with any red-flag warning signs described in the safety section above, don’t delay a clinical assessment. Getting the diagnosis right early makes the whole treatment path shorter.

This article is for informational purposes only and does not replace professional medical advice. Always consult your doctor before starting any treatment.