Acute nephritis can be cured within 3 months. Acute nephritis is caused by glomerulonephritis after acute infection, mostly due to pharyngeal or cutaneous streptococcal infection, which manifests itself with hematuria, proteinuria, edema, hypertension, and transient acute kidney injury 7-20 days after infection. Laboratory tests may show mild anemia, erythrocyturia, proteinuria, and even erythrocyte tubular and leukocyturia on urinalysis. Leukocytes are predominantly neutrophils, occasionally leukocyte tubular pattern is seen, but there is no urinary tract irritation, there is hypocomplementemia, and fluctuating changes can be restored to normal levels within 8 weeks. Acute nephritis pathology can be seen light microscopy for intracapillary proliferative glomerulonephritis, a few severe cases can form crescent, immunofluorescence can be seen in IgG and C3 deposition. Electron microscopy shows subepithelial formation of hump-shaped electron dense material, which can be combined with heart failure, encephalopathy, and acute kidney injury. Since acute nephritis is a self-limiting disease, it usually resolves within 3 months. If acute nephritis is prolonged and the history of the disease is more than 3 months to more than 6 months, consider that it has turned into chronic nephritis.