My grandma has these hard bumps forming on her finger joints near the nails. Why is this spreading?

and Shape Changes: Symptoms to Watch Closely
In addition to the visible bumps, individuals with Heberden’s nodes often experience pain and stiffness in the affected joints. This discomfort can be exacerbated by cold weather or after periods of inactivity.
Over time, the shape of the fingers may change due to the formation of the nodes and the underlying continue reading …