Differential Diagnosis for Left Flank Pain with Pain when Lifting Leg
- Single Most Likely Diagnosis
- Musculoskeletal strain: This is the most likely diagnosis given the symptoms. Lifting a leg can exacerbate musculoskeletal issues in the lower back or flank area, leading to pain.
- Other Likely Diagnoses
- Nephrolithiasis (kidney stones): Pain from kidney stones can be exacerbated by movement, including lifting a leg, and is often felt in the flank.
- Pyelonephritis: An infection of the kidney can cause flank pain that may worsen with movement or lifting.
- Herniated disk: A herniated disk in the lower spine can cause pain in the flank area, especially when lifting or bending.
- Do Not Miss Diagnoses
- Appendicitis (if pain radiates to the right side or is accompanied by other symptoms like fever, nausea): Although appendicitis typically presents with right lower quadrant pain, atypical presentations can occur, and missing this diagnosis can be serious.
- Aortic dissection or aneurysm: Severe, tearing pain in the flank that worsens with movement could indicate an aortic emergency, which is life-threatening and requires immediate attention.
- Pulmonary embolism (if accompanied by respiratory symptoms): While less common, pulmonary embolism can cause flank pain if the embolism affects the upper parts of the lung, and it is crucial not to miss this potentially fatal condition.
- Rare Diagnoses
- Psoas abscess: A collection of pus in the psoas muscle can cause flank pain that worsens with movement, including lifting a leg.
- Retroperitoneal fibrosis: A rare condition characterized by the proliferation of fibrous tissue in the retroperitoneum, which can cause flank pain and other symptoms.
- Eosinophilic granuloma (part of Langerhans cell histiocytosis): A rare condition that can affect various parts of the body, including the bones, and cause pain in the affected area.