Because children in the recovery period of purpura nephritis hematuria lasts a long time, also often occur aggravation, so some parents are very afraid, especially afraid that the child will not end up becoming uremic, or affect the child to marry and have children. In fact, hematuria itself is not harmful to children, because after red blood cells leak out from the glomerulus, they go directly to the renal tubules, renal pelvis, bladder and urethra and are excreted, and are not absorbed by a certain part of the body, thus producing an inflammatory or immune response, and therefore do not cause immune damage to the glomerulus or renal tubules. Much less will it cause anemia due to prolonged microscopic hematuria, nor will it lead to uremia due to the hematuria itself. In fact, there is a disease called benign hematuria, medically known as thin basement membrane nephropathy, which requires a kidney puncture and observation with an electron microscope to determine the diagnosis. Children with this disease will generally spend their lives urinating blood, of course in the vast majority of cases it is microscopic hematuria, and occasionally in times of infection and exertion, there will be transient hematuria in the naked eye. This benign hematuria, although it may be a lifetime of urinating blood, the vast majority of children will be safe and sound, and will neither develop uremia, nor affect the child’s future health and reproductive function. However, if a child with purpura nephritis, who usually has microscopic hematuria during the recovery period, always has carnal hematuria after infection or also has urine protein, it indicates that the child’s kidney condition is more serious and may have changes in kidney function, which should be taken seriously enough.