Cloudy urine after meals may be caused by nephrotic syndrome, filarial infection or pyelonephritis. 1. Nephrotic syndrome: affected by the primary kidney disease, it may cause nephrotic syndrome. This disease will affect the kidney function and cause a large amount of proteinuria, which may also appear as cloudy urine after meals. 2. Filarial infection: when infected by filarial worms, it may cause filarial celiac disease, which causes the rupture of capillary lymphatic vessels and leads to cloudy urine. 3. Pyelonephritis: Pyelonephritis can be caused when the kidneys are infected by bacteria. Inflammatory stimulation may produce a variety of substances, which can also cause cloudy urine after meals. The cloudy urine after meals may be caused by other reasons, and patients should go to the hospital in time.