Sciatica vs SI Joint Pain: How to Tell the Difference (Surrey Chiropractor)

Quick Answer

Sciatica usually causes nerve-related symptoms such as burning, tingling, or pain travelling down the leg, often linked to disc pressure or nerve irritation in the lower spine. Sacroiliac (SI) joint pain is typically felt as deep, localized pain in the buttock or low back that worsens with standing, walking, or changing positions.

Why do people confuse sciatica and SI joint pain?

Both conditions affect the same general region — the lower back and buttock.

Because symptoms can overlap, many patients in Surrey assume they have sciatica when the true source is pelvic joint dysfunction, or vice versa.

The only reliable way to differentiate them is through movement-based assessment.

What is sciatica?

Sciatica refers to irritation of the sciatic nerve.

This nerve originates in the lower spine and travels through the pelvis and down the leg. When mechanical stress affects spinal discs, joints, or surrounding tissues, nerve sensitivity can develop. This is referred to as, “Sciatica Nerve Pain“.

Typical sciatica symptoms include:

• Pain travelling below the knee

• Burning or electric sensations

• Tingling or numbness in the calf or foot

• Symptoms worse with sitting

• Difficulty straightening the leg

• Possible weakness

Sciatica often fluctuates depending on spinal loading and posture.

What is SI joint pain?

The sacroiliac joints connect the pelvis to the base of the spine.

These joints help transfer force between the upper body and legs. When they become restricted or irritated, pain may develop in the lower back or buttock.

Common SI joint pain symptoms include:

• Deep ache in one buttock

• Pain when standing from sitting

• Discomfort when walking or climbing stairs

• Pain turning in bed

• Pain localized above the hip

• Stiffness rather than nerve symptoms

Unlike sciatica, SI joint pain rarely travels far down the leg. Read more about Sacro Iliac Joint Disfunction here. 

Key differences between sciatica and SI joint pain

Sciatica tends to:

• Travel below the knee

• Feel sharp, burning, or tingling

• Be aggravated by prolonged sitting

• Involve nerve tension patterns

• Relate to disc or spinal joint stress

SI joint pain tends to:

• Stay in the buttock or low back

• Feel deep and dull

• Worsen with walking or standing

• Relate to pelvic movement imbalance

• Improve with positional changes

These patterns help guide chiropractic assessment.

Can both conditions happen at the same time?

Yes. This is more common than people expect.

Pelvic joint restriction can increase spinal stress, which may contribute to nerve irritation. Likewise, disc-related sciatica can alter walking patterns and overload the SI joint.

This is why care plans often address both spinal mobility and pelvic stability.

How chiropractic assessment helps identify the cause

At our Surrey chiropractic clinic, evaluation focuses on:

• Lumbar spine movement

• Pelvic coordination

• Nerve tension testing

• Functional movement patterns

• Postural loading habits

Understanding which structures are contributing allows care to be more targeted.

Treatment approaches may include:

• Gentle spinal adjustments

• SI joint mobilization

• Spinal decompression strategies when appropriate

• Muscle release techniques

• Stability and mobility exercises

• Ergonomic and activity guidance

The goal is to improve how the body distributes load and tolerates movement.

When should you seek care?

Consider an assessment if you notice:

• Pain lasting longer than 1-2 weeks

• Symptoms travelling down the leg

• Increasing stiffness in the pelvis

• Difficulty walking or sitting comfortably

• Recurring flare-ups

Early care helps reduce chronic compensation patterns.

Book an Assessment in Surrey

If you are unsure whether your symptoms are coming from the sciatic nerve or the sacroiliac joint, a chiropractic assessment can help clarify the source and guide appropriate care.

Understanding the cause is the first step toward lasting improvement.

Book Now at our Surrey Chiropractic Office in the Guilford Mall area.