SUI happens due to problems in the things that are supposed to keep the urethra (the tube that connects the bladder to the outside of our body) closed during activities. The urethra is supported by a “hammock” of tough tissue. This hammock is also dependent on ligaments that attach the urethra to our part of the pelvic bone and a muscle of the pelvic floor called the pubococcygeus. The urethra itself is composed of several layers of muscle, blood vessels, and other tissue that is also important for maintaining control of leakage. When there are activities that cause an increase in the pressure in the abdomen (what is meant by “stress”) the urethra gets closed by the hammock. However, if the strength of any of these components (hammock, ligaments, pubococcygeus, urethra itself) is poor, urine leakage may occur during certain activities.