Turbidity of urine in chronic nephritis may be caused by physiological reasons such as concentration of urine, or it may be caused by pathological reasons such as proteinuria, chronic nephritis combined with urinary tract infection. 1. Physiological reasons: If the turbidity appears when urinating for the first time in the morning, it may be a transient turbidity caused by drinking less water, or an increase in the concentration of inorganic substances caused by the concentration of urine at night. This is a physiological phenomenon and requires no special treatment. 2. Pathologic causes: (1) Proteinuria: chronic nephritis causes damage to the mechanical barrier or charge barrier of the glomerular filtration membrane, and proteinuria occurs. The density of urine increases, the surface tension increases, and there are more bubbles and sediments in the urine, producing turbid urine. (2) Chronic nephritis combined with urinary tract infection: when patients with chronic nephritis have a bacterial infection in the urinary tract, it will break down many proteins or produce destructive substances, resulting in the shedding of urinary tract mucosa and the appearance of cloudy urine. If patients with chronic nephritis have cloudy urine, it is recommended to go to regular hospitals in time to improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.