Blood in your urine is most ... people who are AMAB than in cisgender women and others assigned female at birth. They form when certain chemicals in your urine crystallize, forming hard stones ...

However, foamy urine can be a symptom of serious health conditions that require immediate medical attention.  You should see ...

These include blood and its various components (including plasma and serum), urine, feces, joint and spinal fluids, swabs ...