Does sacroiliac joint dysfunction cause lower back pain?

The sacroiliac joints sit between the sacrum and the pelvic bones and transfer load between the trunk and legs. Irritation in this area may feel low in the back, often near one side of the pelvis, and may worsen with prolonged standing, stairs, rising from sitting, or rolling in bed. Some people also feel discomfort in the buttock or upper thigh. Lower back pain can arise from discs, spinal joints, muscles, the hip, or other conditions, so location is only one part of the assessment.

Keep gently active if movement is tolerable, and change position regularly rather than staying in bed. Avoid heavy lifting or twisting that repeatedly aggravates symptoms. A physiotherapist can assess pelvic and spinal movement, hip strength, and everyday tasks, then build a gradual plan involving stability, mobility, and load management. Record which activities trigger the pain and whether it travels below the knee, since that detail helps guide the examination.

Book a clinical review if pain is persistent, recurrent, worsening, or interfering with sleep, work, or walking. Seek urgent help for new bladder or bowel changes, numbness around the saddle area, progressive leg weakness, severe pain after significant trauma, fever with severe pain, or unexplained weight loss.

Ask which structures may be involved, whether an examination suggests a sacroiliac source, which activities to modify, and how progress will be measured during rehabilitation.