Urine naturally contains dissolved minerals and salts. When urine sits in the toilet bowl for hours (overnight, for example), the water evaporates slightly and the temperature drops. This causes those dissolved substances to solidify—or crystallize.
You lift the lid to flush and notice something unusual: a fine, glittery sediment or small, sand-like grains settled at the bottom of the bowl. It’s not a cleaning product residue. It might be urine crystals. urine crystals in toilet
Frequent or large amounts of crystals can be an early warning sign. The same crystals forming in your toilet bowl could be forming in your kidneys or bladder. Urine naturally contains dissolved minerals and salts
While startling, seeing crystals in the toilet isn't always a sign of disease. Here’s what you need to know. You lift the lid to flush and notice
A tiny bit of crystal sediment in the toilet, with no other symptoms, is rarely a concern—especially in the morning or after a hot, low-water day. But if you consistently see sand-like grains, or if you have any pain or urinary changes, call your doctor. A simple urine test can determine the crystal type and whether you need to make dietary changes or be evaluated for kidney stones.