the.com/kidney stone

A small, hard mineral deposit in the kidney that can cause intense pain when it passes.

means A hard mass of crystallized minerals and salts that forms inside the kidney and can cause severe pain as it passes through the urinary tract.

from Straightforward compound English: 'kidney,' from Middle English 'kidenei' (origin itself murky, possibly related to Old Norse or a blend of 'cwið' meaning womb/belly and 'ey' meaning egg, describing the organ's shape), plus 'stone,' from Old English 'stan,' used for centuries to describe any hard mineral mass — gallstones and kidney stones alike earned the name simply because they are, medically and unglamorously, small stones that grow where they absolutely should not.

actual size
often smaller than a grain of rice
pain cause
stretches and scrapes the ureter walls
risk factor
not drinking enough water, mostly
nickname
Doctors sometimes compare the pain to childbirth
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