AANP Family Nurse Practitioner (FNP) Certification ExamDiagnosisEasy
A 45-year-old female presents with a 6-month history of diffuse, dull, aching pain in her muscles and joints, accompanied by profound fatigue, non-restorative sleep, and cognitive difficulties (''fibro fog''). She reports tenderness in multiple specific areas upon palpation. Laboratory tests, including CBC, thyroid function, and inflammatory markers (ESR, CRP), are all within normal limits. What is the most likely diagnosis?
- ARheumatoid Arthritis (RA)
- BFibromyalgia
- CHypothyroidism
- DSystemic Lupus Erythematosus (SLE)
Show answer & explanationAnswer & explanation
Correct answer: B. Fibromyalgia
The constellation of widespread musculoskeletal pain, fatigue, sleep disturbances, cognitive issues, and multiple tender points, with normal inflammatory markers, is highly characteristic of fibromyalgia.
Why the other options are wrong
- A. RA typically presents with symmetrical polyarthritis, morning stiffness, joint swelling/deformity, and elevated ESR/CRP, which are absent here.
- C. Hypothyroidism can cause fatigue and muscle aches, but typically has abnormal thyroid function tests and does not present with characteristic tender points or 'fibro fog' as primary features.
- D. SLE is a systemic autoimmune disease with diverse symptoms (rash, serositis, renal involvement) and positive autoantibodies, not just widespread pain with normal labs.
Fibromyalgia
A chronic disorder characterized by widespread musculoskeletal pain, fatigue, sleep problems, and cognitive difficulties, often accompanied by tenderness in specific areas.
- Widespread pain is a hallmark, often accompanied by fatigue and sleep disturbances.
- Diagnosis is clinical, based on symptoms and exclusion of other conditions.
- Laboratory tests are typically normal.
Memory trick: Fibro Fog: Feeling Fuzzy, Fatigued, and Full of Pain.