Quick Answer
Ankylosing spondylitis causes chronic inflammation of the spine and sacroiliac joints. Early treatment with biologics can prevent spinal fusion.
Medically reviewed by Dr. Shree Narayan Yadav • NMC 14227 • Kathmandu Neurology Clinic & Cognitive Center
Ankylosing spondylitis (AS) is a chronic inflammatory autoimmune disease that primarily targets the sacroiliac joints and spine. It belongs to a group of conditions called spondyloarthropathies. AS most commonly affects young adults, with onset typically between 15 and 45 years, and is more common in men than women. The hallmark symptom is chronic low back pain that is inflammatory in nature — worse in the morning, improved with activity, and associated with prolonged morning stiffness.
As the disease progresses, inflammation can lead to fusion (ankylosis) of the vertebrae, resulting in reduced spinal mobility and a characteristic forward-stooping posture. Peripheral joints (hips, knees, ankles) and entheses (where tendons attach to bone) may also be involved. Extra-articular manifestations include uveitis (eye inflammation), inflammatory bowel disease, and psoriasis.
Dr. Shree Narayan Yadav — consultant physician & joint and autoimmune disease specialist at Kathmandu Neurology Clinic & Cognitive Center provides evidence-based evaluation for ankylosing spondylitis.
Diagnosis involves clinical assessment, HLA-B27 genetic testing (positive in approximately 90% of AS patients), inflammatory markers (ESR, CRP), and imaging. MRI of the sacroiliac joints can detect early inflammation before structural changes appear on X-ray. Treatment includes NSAIDs as first-line therapy, physical therapy to maintain spinal mobility, and biologic agents (TNF inhibitors or IL-17 inhibitors) for patients with active disease. Early diagnosis and consistent treatment are crucial to preventing irreversible spinal damage.
This article is educational and does not replace individual medical advice.
Frequently asked questions
Answers reviewed by Dr. Jitendra Prasad Yadav • MBBS, MD (Internal Medicine), FICN (Neurology), FCNV, FIHM • NMC 8029
No. AS causes inflammatory back pain -- worse at rest, improves with activity, and associated with morning stiffness lasting more than 30 minutes. Regular mechanical back pain typically worsens with activity and improves with rest.
Without treatment, progressive spinal fusion can occur over years. Early and consistent treatment with NSAIDs, exercise, and biologic therapy when indicated can significantly reduce the risk of fusion and preserve spinal mobility.
Migraine is a neurological condition; headache is one feature. Associated symptoms and functional impact are important for diagnosis.
Aura refers to visual, sensory, or speech symptoms that precede the headache in some people. Both types are migraine; the presence of aura may influence management discussion.
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References & Review
Reviewed by Dr. Jitendra Prasad Yadav • Last reviewed: 2026-09-04
- International Classification of Headache Disorders, 3rd edition (ICHD-3).
- Harrison's Principles of Internal Medicine — Neurology sections.
- American Academy of Neurology guidelines for selected conditions (where applicable).
Content is educational and aligns with standard medical references; individual evaluation may vary. External links provide context and do not imply endorsement.