Ankylosing spondylitis (AS) is an inflammatory type of arthritis that mainly affects the spine and the joints connecting the spine to the pelvis (sacroiliac joints). It can also affect other joints, such as the hips, shoulders, and knees.

The condition causes pain and stiffness, particularly in the lower back and buttocks. Symptoms are usually worse in the morning or after periods of rest and improve with movement or exercise.

Over time, ongoing inflammation may lead to reduced flexibility, permanent changes in posture and, in some people, fusion of the bones of the spine. Early diagnosis and treatment can help control inflammation, reduce pain, and maintain mobility.

Disclaimer:

The information provided on our website is for educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare professional for advice regarding your individual health and medical needs.

Compiled by the AKU Medical College Center for Clinical Best Practices

Last Updated: June 2026