Children with purpura nephritis do not usually have frequent urination in the early stages, but whether or not this occurs varies from person to person. It will not occur in some children and may occur in others. Some children who suffer from purpura nephritis do not have obvious clinical manifestations in the early stage, and even some children will not have symptoms such as hematuria and proteinuria. However, some children with purpura nephritis may have urinary frequency and urgency, or even hematuria and proteinuria if combined with urinary tract infection in the early stage, and some children may also have symptoms of purpura nephritis such as lower limb edema and elevated blood pressure. If children are found to have purpura nephritis, it is recommended that they go to a regular hospital in time and receive standardized treatment under the guidance of a doctor.