Final answer:
The client is feeling better due to the RA treatment received during the hospital stay.
Step-by-step explanation:
The client is feeling better because they have received treatment for the exacerbation of their rheumatoid arthritis (RA). RA is a chronic autoimmune disease that causes joint inflammation and pain. The client's symptoms improved due to the interventions provided during their hospital stay, such as rest, medication, and physical therapy.