When to see a doctor
By Mayo Clinic staffCall your doctor for a same-day appointment if you have:
- Constant, dull, one-sided pain in your back or flank
- Fever, body aches and fatigue
- Recent history of a urinary tract infection
A blood clot or a hemorrhage in your kidney causes sudden pain in your lower abdomen and flank, and possibly a great deal of blood in your urine. This is an uncommon complication of a kidney injury or other kidney disorders, including atherosclerosis of the renal artery, a bleeding disorder or kidney embolism. Any interruption in circulation to the kidney is an emergency, so it's important to seek emergency care if you develop severe kidney pain, with or without bloody urine.
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- Kanso AA, et al. Microvascular and macrovascular diseases of the kidney. In: Brenner BM. Brenner & Rector's The Kidney. 8th ed. Philadelphia, Pa.: Saunders Elsevier; 2008. http://www.mdconsult.com/books/about.do?about=true&eid=4-u1.0-B978-1-4160-3105-5..X5001-4--TOP&isbn=978-1-4160-3105-5&uniqId=230100505-57. Accessed May 4, 2011.
- Meyrier A. Diagnosis and management of renal infections. Current Opinion in Nephrology and Hypertension. 1996;5:151.
- Wilkinson JM (expert opinion). Mayo Clinic, Rochester, Minn. May 5, 2011.

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