What should you know about non ankylosing spondylitis?

People sometimes use this phrase when they are describing back or pelvic symptoms without a confirmed diagnosis of ankylosing spondylitis. Similar discomfort can arise from muscle strain, wear-related changes, another inflammatory condition, or a problem outside the spine. Ankylosing spondylitis is a specific inflammatory condition that can affect the joints between the spine and pelvis. A clinician considers the pattern of pain, examination findings, medical history and, when appropriate, imaging or laboratory tests.

Stiffness that is worse after rest, reduced spinal movement, or pain around the buttocks can be useful details to record. These symptoms do not identify one condition by themselves. Read about [Joint Stiffness](/symptoms/joint-stiffness/) and [Morning Joint Stiffness](/symptoms/morning-joint-stiffness/) for related symptom information.

Arrange an assessment if symptoms persist, recur, or interfere with sleep, work or movement. Keep a brief symptom record showing when stiffness starts, what activity changes it, and whether other joints or areas are involved. Treatment depends on the cause and may include a tailored movement programme, activity adjustments, pain relief or specialist review. [Physiotherapy](/treatments/physiotherapy-and-rehabilitation/physiotherapy/) and [Exercise Therapy](/treatments/physiotherapy-and-rehabilitation/exercise-therapy/) may help restore movement when they are suitable for your findings. Do not start anti-inflammatory medicine regularly without checking that it is appropriate for you.

Seek urgent medical help for new loss of bladder or bowel control, numbness around the genitals, rapidly worsening leg weakness, or severe back pain after a significant injury. Contact a clinician promptly for fever with back pain, unexplained weight loss, pain that is constant at night, or symptoms that are steadily worsening. These features need assessment because they can signal a problem requiring more than routine self-care.

Ask: What diagnoses could explain my pattern of stiffness? Do I need imaging or blood tests? Which movements are safe while symptoms are active? What findings would prompt referral to a rheumatology or spine specialist? Could my reduced movement need a supervised plan?