An advanced practice registered nurse (APRN) is assessing a patient who presents to the clinic with aching and stiffness of the neck, shoulder, and pelvic girdle. The patient complains that the stiffness typically lasts all morning. The patient's ESR and C-reactive protein are both elevated. Which condition should the APRN suspect?

Osteoarthritis typically presents with joint pain and stiffness, but it is more associated with mechanical wear and tear rather than systemic inflammation. Morning stiffness in osteoarthritis usually resolves within 30 minutes, unlike the prolonged stiffness seen in polymyalgia rheumatica. Therefore, the symptom profile does not align with osteoarthritis.

While lupus can cause joint pain and inflammation, it generally presents with a wider variety of systemic symptoms, such as skin rashes and organ involvement. The specific pattern of stiffness in the shoulders, neck, and pelvic girdle, coupled with the elevated inflammatory markers, is less typical for lupus compared to polymyalgia rheumatica.

Raynaud phenomenon is characterized by episodes of reduced blood flow to the fingers and toes, leading to color changes and discomfort, usually triggered by cold or stress. It does not explain the widespread aching and stiffness in the neck, shoulder, and pelvic girdle, nor does it correlate with elevated inflammatory markers like ESR or C-reactive protein.