Varicocele is common on left testis because:

Ans. (b) Left testicular vein drains into left renal vein which has high pressureCauses for varicocele common on left side:* Left testicular vein drains into the left renal vein and has more chances of blockage.* Total length of Left testicular vein is more on the Left side than on Right sides.* In about 15% cases testicular artery arches over the left renal veins and obstructs it.* Left renal vein passes in between the superior Mesenteric A and the abdominal aorta behind; and thus compressed between the two arteries;* Loaded sigmoid colon compresses on the left side.* Left suprarenal vein also drains into Left renal vein and hence circulating adrenaline may cause constriction.* Incompetent valves are more common on Left side* Renal cell carcinoma can invade into the Renal vein obstructing the testicular Vein on Left side; (Varicoele that is Irreducible.)* Perpendicular drainage of testicular vein into renal vein on left side.