It will leak around the outside of the catheter instead Catheter leakage is common affecting many people with indwelling catheters. Check for and remove any kinks in the catheter or the drainage bag tubing.
Foley Catheter Basic Info and Tips - Caregiverology
What mainly prevents leakage is that the catheter is larger than the narrowing and sphincters of the urethra, but it's certainly possible that these narrowings might be larger than the diameter of the catheter, allowing urine to leak, particularly in certain positions like sitting.
Urine leakage around a catheter is a problem associated with indwelling catheters
Leakage can be caused by bladder spasms, which feel like stomach cramps and are quite common when you have a catheter in your bladder. This is the balloon of water that sits in the neck of the bladder that keeps the catheter from sliding out Also be sure that the cath is patent. Other causes include infection, catheter encrustation, and loss of elasticity of the female urethra
