Renal hamartoma (also called angiomyolipoma) is a benign mix of fat, blood vessels, and muscle in the kidney. Most stay quiet, but if they grow or bleed they send clear signals.
Painless flank ache is the early clue. It feels like a dull bruise below the ribs on one side and can throb after exercise or long sitting.
Sudden severe pain means bleeding. The tumor’s fragile vessels burst, and the kidney swells fast—like a blow to the back that doesn’t fade.
Blood may appear. Urine can turn light pink or contain small clots, often without any burning.
A swollen lump or heavy feeling on one side can show up if the hamartoma grows large.
Low-grade fever or night sweats can appear after a bleed, but true infection is rare.
Late signs include weight loss, fatigue, or a drop in blood count if bleeding is heavy or repeated.
| Symptom | What You See | Quick Check |
|---|---|---|
| Ache | Dull flank bruise | After long sit |
| Bleed | Sudden back blow | No fade |
| Blood | Pink, small clots | First morning look |
| Lump | Side heavy, swollen | Feel flank |
| Fever | Low temp, sweats | After bleed |
| Late | Weight drop, fatigue | Track blood count |