SI joint pain is a painful condition that affects one or both sacroiliac joints, which sit where the lower spine and pelvis meet. The pain of sacroiliitis most often occurs in the buttocks and lower back, and it can also affect the legs, groin, and feet. The following are some of the potential causes of SI joint pain:

• Injury: A sudden impact, such as a motor vehicle accident or a fall, can damage the sacroiliac joints.
• Arthritis: Wear-and-tear arthritis (osteoarthritis) can occur in sacroiliac joints, as can inflammatory arthritis, such as ankylosing spondylitis.
• Pregnancy and post-partum: Hormonal changes during pregnancy can cause the ligaments that support the sacroiliac joints to relax, leading to instability and pain.
• Repetitive stress: Repetitive stress on the sacroiliac joints, such as from jogging or taking uneven strides when walking, can cause inflammation and pain.
• Spinal surgery: SI joint pain can occur following spinal surgery.

It is important to note that sacroiliac joint pain can be difficult to diagnose, as other conditions can cause similar symptoms. If you are experiencing pain that doesnt get better on its own in a week, it is recommended to visit a healthcare provider to understand whats causing the pain and how to treat it.