Causes

Possible causes of kidney pain include:

• Bleeding in the kidney (hemorrhage)
• Blood clots in kidney veins (renal vein thrombosis)
• Hydronephrosis
• Kidney cancer or a kidney tumor
• Kidney cysts
• Kidney infection (pyelonephritis)
• Kidney stones
• Polycystic kidney disease

Kidney stones are likely to cause pain only when they start to move out of the kidney. Also, it's possible to have one of these conditions, particularly most kidney cancers, and not have kidney pain.