What causes hematuria in children?

Patient's question:

Patient Gender: Female
Age:
Detailed Medical Condition and Purpose of Consultation: After an upper respiratory tract infection last year, a urine test showed normal and abnormal results at times. Seeking medical consultation.
Duration of Current Illness: One year
Current General Condition: Blood 2+
Medical History:
Previous Diagnoses and Treatment History and Outcomes: After an upper respiratory tract infection last year, a urine test showed normal and abnormal results at times.
Ancillary Examinations: CT
Other:

Doctor's answer:

Hello:
It is possible to have acute glomerulonephritis, which is often abbreviated as acute nephritis. Broadly speaking, it refers to a group of glomerular diseases with diverse etiologies and pathogenesis, but clinically characterized by acute onset, hematuria, proteinuria, edema, hypertension, and a decline in glomerular filtration rate. Therefore, it is also commonly referred to as acute nephritis syndrome. Clinically, the majority of cases are acute post-streptococcal glomerulonephritis. This condition is the most common kidney disease in children. The age range is most commonly between 3 and 8 years old, with rare cases under 2 years. The male-to-female ratio is approximately 2:1.
  【Diagnosis】
  Typical acute nephritis is not difficult to diagnose. After a 1- to 3-week asymptomatic incubation period following streptococcal infection, symptoms such as edema, hypertension, and hematuria (which may be accompanied by varying degrees of proteinuria) appear. The dynamic changes in blood complement C3 levels can confirm the diagnosis.
  【Treatment Measures】
  Currently, there is no specific treatment targeting the renal glomerular immune pathological process. The main approach is to correct the pathophysiological process (e.g., water and sodium retention, excessive blood volume) through symptomatic treatment, prevent acute complications, protect renal function, and allow for natural recovery.
  1. During the acute phase, bed rest is recommended, typically for 2 to 3 weeks. Gradual increases in indoor activity can be resumed once gross hematuria disappears, blood pressure returns to normal, and edema subsides. Mild residual proteinuria and hematuria should be closely monitored, and prolonged bed rest is unnecessary. If urinary changes worsen, a second period of bed rest may be required. Avoid strenuous physical activity for the first 3 months. Gradually increase activity after stopping bed rest, and if no clinical symptoms persist after 2 months, urinary function usually returns to normal.

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