5. Bursitis
Bursitis is the inflammation of the small fluid-filled sacs (bursae) that cushion the heel and reduce friction between tissues. Heel bursitis often causes pain and swelling, especially when walking or running.
6. Ankylosing Spondylitis and Reactive Arthritis
Although less common, systemic conditions like ankylosing spondylitis (a chronic inflammatory disease of the spine) and reactive arthritis (joint inflammation triggered by infection) can also cause heel pain as part of wider musculoskeletal symptoms.
