Sacroiliac Joint Dysfunction occurs when one or both SI joints become inflamed, unstable, or restricted. Because these joints support the weight of your upper body and help transfer forces to your legs, even minor dysfunction can result in significant discomfort.

This condition can mimic other sources of back pain — including herniated discs, sciatica, or hip disorders — which is why a proper diagnosis is important for effective treatment.

SI Joint Dysfunction can develop from several factors, including:

• Joint instability – too much movement (hypermobility) causing stress and inflammation

• Restricted motion – too little movement (hypomobility) leading to stiffness and pain

• Arthritis – wear-and-tear or inflammatory arthritis affecting the SI joints

• Injury or trauma – falls, car accidents, or lifting injuries that strain the joints

• Pregnancy – hormonal changes and altered posture can place additional stress on the SI joints

• Repetitive stress – activities such as running, heavy lifting, or uneven leg length

Symptoms often overlap with other spine and hip conditions, but common signs include:

• Pain in the lower back, buttocks, hips, or groin

• Pain that worsens with standing, walking, climbing stairs, or transitioning from sitting to standing

• Pain on one side of the lower back (though sometimes both sides are affected)

• Stiffness or instability in the pelvis or lower back

• Discomfort when lying on the affected side

• Pain that may radiate into the thigh, but rarely past the knee