acute pyelonephritis
Medical term for a sudden bacterial infection of the kidney pelvis and kidney tissue, often causing fever, flank pain, and urinary symptoms.
Acute pyelonephritis is often accompanied by high fever and back pain.
I was diagnosed with acute pyelonephritis through a urine test.
Compound of 急性 (acute) + 腎盂 (renal pelvis) + 腎炎 (nephritis). The term is a modern medical coinage using Sino-Japanese morphemes.