Inflammatory back pain is the most common symptom and the first manifestation of AS in approximately 75% of patients. The pain is insidious in onset, associated with morning stiffness, improves upon activity, and is worse with sitting.
Approximately 50% of patients with AS have neck pain as an early symptom.
Dactylitis is present in approximately 6% of patients with AS. It is characterized by diffuse swelling of a whole finger or toe ("sausage digit"), which may be painful. It usually occurs in one or only a few digits at a time; if all digits of an extremity are involved, a different etiology should be considered.
Learn more about the clinical presentation of AS.
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Cite this: Herbert S. Diamond, Marina Magrey. Fast Five Quiz: Ankylosing Spondylitis Signs and Symptoms - Medscape - Mar 16, 2023.