Blood and protein in the urine after a fever usually return to normal in a week or so. However, if the proteinuria persists, you may have kidney disease and need to be examined promptly. Elevated protein in urine is normal when you have a fever, usually transient, and the protein in urine usually returns to normal about a week after the fever goes down. However, if the urine protein is persistently elevated, you need to go to the hospital for formal examination and treatment. You should follow the doctor’s instructions to improve the urine routine, 24h urine protein, double kidney ultrasound, renal function, complement level, anti-nuclear antibody and other indicators, if necessary, need to improve the renal puncture biopsy. Symptomatic treatment after clarifying the cause of the disease can slow down the condition. Persistent fever can induce kidney disease, and not timely examination and treatment will lead to the deterioration of kidney disease. Patients with urinary protein after fever should consult a regular hospital in time and undergo standardized treatment recommended by the doctor.