What Causes Flank Pain? Common & Serious Causes Explained
Flank pain can be caused by Kidney Cancer (Renal Cell Carcinoma), Polycystic Kidney Disease, Renal Artery Stenosis and other conditions. Learn which causes are serious, which are benign, and when to seek urgent medical evaluation.
Updated March 27, 2026
Flank pain has multiple causes, ranging from benign to serious. The most common include Kidney Cancer (Renal Cell Carcinoma), Polycystic Kidney Disease, Renal Artery Stenosis. Renal cell carcinoma is the most common kidney cancer in adults, often discovered incidentally on imaging. Symptoms include hematuria, flank pain, and a palpable mass; smoking and obesity are key risk factors.
Clinical Context
The causes of flank pain range from benign to serious. Identifying the underlying cause requires clinical evaluation. Common causes include Kidney Cancer (Renal Cell Carcinoma), Polycystic Kidney Disease, Renal Artery Stenosis, Hydronephrosis, and others.
Clinical Pathway
Flank pain — Symptom HubSymptomKidney Cancer (Renal Cell Carcinoma) — Full Condition GuidePrimary CauseKidney Cancer (Renal Cell Carcinoma) — Differential DiagnosisDifferentialPolycystic Kidney Disease — Full Condition GuideCauseRenal Artery Stenosis — Full Condition GuideCauseHydronephrosis — Full Condition GuideCauseFrequently Asked Questions
Why do I have flank pain? common & serious causes explained?+
Flank pain has multiple causes, ranging from benign to serious. The most common include Kidney Cancer (Renal Cell Carcinoma), Polycystic Kidney Disease, Renal Artery Stenosis. Renal cell carcinoma is the most common kidney cancer in adults, often discovered incidentally on imaging. Symptoms include hematuria, flank pain, and a palpable mass; smoking and obesity are key risk factors.
What is the most common cause of flank pain?+
Common causes include Kidney Cancer (Renal Cell Carcinoma), Polycystic Kidney Disease, Renal Artery Stenosis. The most likely cause depends on age, associated symptoms, and medical history.
When is flank pain dangerous?+
Seek medical attention if flank pain is persistent, worsening, sudden in onset, or accompanied by other concerning symptoms.
Can flank pain be caused by stress or anxiety?+
Yes — psychological stress can contribute to many physical symptoms, but organic causes should be excluded by a healthcare provider.
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