Swollen feet, fever may be caused by the following reasons: First, acute glomerulonephritis, if a normal person suddenly appear fever, swollen feet and other symptoms, check urine routine shows positive urine protein, urine occult blood, then should be considered for acute glomerulonephritis, the patient should be bed rest, avoiding labor, fever and anti-inflammatory treatment. Second, chronic glomerulonephritis relapse, if the patient has a history of chronic glomerulonephritis, suddenly appear fever and swelling of the feet, check urine routine shows positive urine protein, positive occult blood, 24-hour urine protein elevation, blood albumin decline, etc., then consider for chronic glomerulonephritis relapse, give hormones and immunosuppressant drugs for treatment, after active treatment, the condition can be better controlled.