A colostomy and an ileostomy are two kinds of surgery. These
surgeries are done when a part of your intestine is diseased or damaged and
doesn't work right. The surgeon makes a hole in your belly and connects part of
the small or large intestine to that opening in the skin. This opening is
called the stoma.
After you have a colostomy or ileostomy, waste leaves your body
through the stoma instead of the anus. There is no muscle around the stoma, so
you are not able to control when waste or gas passes out of your body. To
collect the waste, an odor-proof plastic pouch (an ostomy pouch) is connected
to the stoma and held to your skin with an adhesive.