Final answer:
The given information does not specify the primary reason for the client's hospitalization on Day 3. The website hypothetically provides information about a patient with joint pain and leg weakness due to gout, where pain and inflammation from uric acid crystals can cause weakness.
Step-by-step explanation:
The primary reason for the client's hospitalization on Day 3 is not provided within the context of this information. However, upon visiting the provided website (which as a tutor, we do not actually visit for reference), one could hypothetically learn about a patient who arrives at the hospital with joint pain and weakness in his legs. The cause of this patient's weakness associated with gout could be due to the inflammation and pain resulting from uric acid crystal deposits in the joints, which is a characteristic symptom of gout. The pain and inflammation can be severe enough to cause significant discomfort and limit mobility, leading to weakness in the legs.