A high fever by itself does not usually cause nephritis. Nephritis usually has a specific cause, for example, acute nephritis is most commonly seen after streptococcal infection, but can also be caused by other bacterial, viral and parasitic infections. Usually, the patient has a history of cold for about a week. When the pathogenic microorganisms enter the body, they produce an immune response, inducing the body to produce immune complexes, which leads to kidney damage, and the patient may have hematuria, proteinuria, swelling, and high blood pressure. Treatment is recommended to actively rest, and at the same time give symptomatic drug treatment, clinical use of penicillin drugs for treatment, a very small number of patients can be converted to chronic nephritis, most of the cases with active and effective treatment, can be restored to normal.