What Are the Symptoms of Ankylosing Spondylitis?

Ankylosing spondylitis (AS) manifests with various symptoms, including low back and sacroiliac pain, morning stiffness, peripheral joint swelling and pain, restricted spinal mobility, and extra-articular organ involvement. This condition is a chronic inflammatory disease primarily affecting the spine and sacroiliac joints. Its progression is gradual; therefore, prompt medical evaluation and treatment are essential if severe spinal deformity, ocular redness and swelling, or visual impairment occur.

1. Low back and sacroiliac pain: Pain typically localizes to the lumbar-sacral region and buttocks, presenting as a dull or aching sensation. Notably, pain often worsens after nighttime rest. Discomfort is particularly pronounced during turning in bed or nocturnal sleep, while physical activity provides partial relief. As the disease progresses, pain may ascend along the thoracic and cervical spine, significantly interfering with daily functioning.

2. Morning stiffness: Morning stiffness is a hallmark feature of AS. Upon waking, patients experience stiffness and reduced flexibility in the lower back and spine. The duration of stiffness varies among individuals but gradually subsides with movement and gentle stretching of the lumbar and dorsal regions. More advanced disease correlates with longer-lasting stiffness, which worsens with inactivity and impairs morning mobility.

3. Peripheral joint swelling and pain: Swelling and pain may affect peripheral joints such as the hips, knees, and shoulders. Often, unilateral joint involvement occurs initially. Inflammation targets the synovial membrane, causing localized hyperemia and impairing joint flexion and extension. Hip involvement is relatively common; persistent inflammation can damage joint architecture and compromise limb mobility.

4. Restricted spinal mobility: Reduced spinal mobility develops progressively as inflammation damages spinal ligaments and adjacent bony structures, leading to fibrosis and eventual ossification. Flexion, extension, and rotation of the spine become increasingly limited. In severe cases, postural abnormalities may develop. Early intervention can delay spinal fusion and preserve functional mobility.

5. Extra-articular organ involvement: Extra-articular manifestations may affect multiple organ systems. Ocular inflammation (e.g., anterior uveitis) is frequent; cardiovascular and pulmonary tissues may also be involved. Some patients experience recurrent ocular symptoms alongside chest tightness or dyspnea. These systemic features are easily overlooked and require integrated assessment with spinal and articular findings to avoid diagnostic delay and ensure timely intervention.

Maintain regular, moderate stretching and range-of-motion exercises; practice proper posture during sitting and sleeping; ensure adequate warmth for the lumbar and dorsal regions; consume a balanced, nutrient-rich diet; and undergo routine follow-up evaluations to slow disease progression and mitigate structural damage to the spine and joints.