As osteoarthritis progresses, these nodes may appear on multiple fingers, giving the impression that they are spreading. Genetics, aging, and repeated strain on the hands all play a role in how the condition develops and worsens over time.

Along with the visible bumps, people may experience pain, stiffness, and reduced flexibility in their fingers.

Tasks requiring fine motor skills—like buttoning clothes or writing—can become more difficult. Cold weather or inactivity can make symptoms worse.

Doctors usually diagnose these bumps through a physical exam and may use X-rays to assess joint damage.