How ankylosing spondylitis can affect the feet

The heel is a frequent site because the Achilles tendon and the band beneath the sole attach there. Foot symptoms deserve assessment because injury, gout, infection and other forms of arthritis can produce similar problems.

Inflammation where a tendon or ligament meets bone is called enthesitis. At the foot, it may cause tenderness behind or beneath the heel, pain with the first steps after rest, or discomfort during push-off. An ankle, midfoot or toe can also become painful and swollen.

Foot involvement may occur on one side or both and may change over time. Ankylosing spondylitis often presents with stiffness after rest that eases with gentle movement, but that pattern alone cannot identify the cause of foot pain.

Have persistent heel or joint pain examined. The clinician may check swelling, warmth, tender attachment points, ankle movement, footwear and walking pattern, then consider whether imaging or other tests are useful.

During a painful spell, reduce impact activities without becoming completely inactive. Supportive shoes, temporary activity changes, and exercises for ankle mobility and calf strength may help when individually selected. A physiotherapist can adjust loading so the irritated tissue is challenged gradually rather than repeatedly aggravated.

Follow the wider ankylosing spondylitis plan prescribed by your rheumatology team, because treating systemic inflammation can matter alongside local foot care.

Seek urgent assessment for a hot, very swollen joint with fever or feeling acutely unwell; an open wound with spreading redness; a foot that becomes pale, blue or cold; sudden inability to bear weight after an injury; or new marked weakness or loss of sensation.

Book a timely review if pain keeps altering your gait, swelling persists, footwear no longer fits comfortably, or home measures are not restoring normal activity.

Point to the exact painful spot and ask whether it seems to arise from a joint, tendon attachment or another structure. Also ask which activities to modify, what footwear features suit your walking pattern, and how progress should be judged.