ANSWER: OSTEOARTHRITIS
EXPLANATION:
Osteoarthritis is the most common form of arthritis (i.e inflammation of one or more joints causing stiffness and pain). It affects more than 30millions people worldwide.
Moreover, It occurs over a period of time, where the protective cartilage that cushions the ends of bones (articulated at the joint) wears down.
Hence, it can damage any joint (including in the hands, spine, hips, and knees).
However, this medication, physiotherapy and in some cases surgery (joint replacement) can help reduce pain and stiffness of the joint.
Thus, the 55-year-old executive assistant is diagnosed for Osteoarthritis, after evaluating pain in her wrist. This is presumably caused by the fact that she is ageing and the nature of her work.