Lower back pain is one of the most common reasons people seek medical care, but not all pain in the lower back region comes from the spine itself. For many patients, the source of discomfort may be the sacroiliac (SI) joints, which connect the lower spine to the pelvis.

Because SI joint pain and lower back pain can feel very similar, identifying the difference can be challenging. Understanding the location, symptoms, and causes of each type of pain can help patients seek the right evaluation and treatment.

What Is the Difference Between SI Joint Pain and Lower Back Pain?

The main difference between SI joint pain and lower back pain is where the problem originates.

SI joint pain comes from irritation, inflammation, or dysfunction in the sacroiliac joints. These joints sit on either side of the lower spine, connecting the sacrum to the pelvic bones. They help absorb shock and transfer movement between the upper body and legs.

Lower back pain often originates from structures within the lumbar spine, including spinal discs, facet joints, nerves, muscles, or ligaments.

Where Is SI Joint Pain Usually Felt?

SI joint pain is often described as pain near the dimples of the lower back, just above the buttocks. Many patients experience pain on one side, although it can occur on both sides.

• Pain in the lower back or buttocks
• Pain that worsens when standing for long periods
• Discomfort when climbing stairs or walking uphill
• Pain when getting up from a seated position
• Difficulty turning over in bed
• Pain with twisting movements

What Are Common Symptoms of Lower Back Pain?

Lower back pain can develop from muscle strain, degenerative changes, herniated discs, spinal stenosis, or irritated spinal joints.

• Aching or stiffness across the lower back
• Pain with bending, lifting, or sitting
• Muscle tightness or spasms
• Pain traveling down the leg
• Numbness, tingling, or weakness

How Can You Tell If Your Pain Is Coming From the SI Joint?

Determining whether pain comes from the SI joint or lower back usually requires an evaluation by a medical professional. A physician may review symptoms, perform physical examinations, and use diagnostic tools to identify the source of pain.

In some cases, a diagnostic SI joint injection may be used to confirm whether the joint is contributing to symptoms.

What Causes SI Joint Pain?

• Injury from a fall, accident, or sports activity
• Repetitive stress on the pelvis and lower back
• Arthritis or joint degeneration
• Pregnancy-related pelvic changes
• Changes in walking patterns or biomechanics
• Previous spine surgery

What Causes Lower Back Pain?

• Herniated or bulging discs
• Degenerative disc disease
• Facet joint arthritis
• Spinal stenosis
• Muscle or ligament injuries
• Repetitive strain

Can SI Joint Pain Be Treated Without Surgery?

Many patients with SI joint pain improve with conservative treatment approaches, including physical therapy, activity modification, targeted injections, regenerative medicine options in appropriate cases, and minimally invasive procedures for persistent symptoms.

Can Lower Back Pain Be Treated Without Surgery?

Treatment depends on the underlying cause. Options may include physical therapy, rehabilitation programs, targeted injections, lifestyle modifications, and minimally invasive spine procedures when appropriate.

When Should You See a Specialist for SI Joint or Lower Back Pain?

Persistent or worsening pain should be evaluated, especially when symptoms interfere with daily activities, sleep, work, or exercise.

• Pain lasting longer than several weeks
• Difficulty standing or walking comfortably
• Limited daily activities
• Numbness, tingling, or weakness
• Symptoms that continue despite conservative care

Understanding the Source of Your Pain Is the First Step Toward Relief

SI joint pain and lower back pain can feel nearly identical, but the underlying causes and treatment approaches may be different. Identifying the true source of pain is essential for creating an effective treatment plan.

If you are experiencing ongoing lower back, hip, or buttock pain, a comprehensive evaluation can help determine whether your symptoms are related to the SI joint, the spine, or another condition. With the right diagnosis, patients can explore targeted treatment options designed to improve mobility and quality of life.