Chyluria is due to-

The most common presentations of the lymphatic filariases are asymptomatic (or subclinical) microfilaremia, hydrocele , acute adenolymphangitis (ADL), and chronic lymphatic disease. If there is obstruction of the retroperitoneal lymphatics, increased renal lymphatic pressure leads to rupture of the renal lymphatics and the development of chyluria, which is usually intermittent and most prominent in the morning. (Harrison's Principles of internal medicine, 20th edition, page 1747)