A Glossary of Ostomy Terms

An ostomy glossary explains the specialised language used after bowel or urinary diversion surgery. Terms cover the stoma, surrounding skin, pouching systems, output and common complications. Understanding this vocabulary helps people with a colostomy, ileostomy or urostomy follow clinical advice, describe symptoms clearly and take part in their own care. Definitions below reflect mainstream nursing and surgical usage.

Types of ostomy

An ostomy is a surgically created opening that lets faeces or urine leave the body when the usual route is not possible or not safe. Stoma usually means the visible pink opening on the abdomen; ostomy often means the whole arrangement. Clinicians sometimes use the words interchangeably.

Colostomy, ileostomy and urostomy

A colostomy brings a section of colon (large bowel) to the skin. Output is often formed or semi-formed, depending on how far along the colon the stoma sits.

An ileostomy brings the ileum (the last part of the small bowel) to the skin. Output is typically looser and more frequent, and it contains enzymes that can irritate unprotected skin.

A urostomy diverts urine away from the bladder. The usual construction is an ileal conduit: a short piece of ileum carries urine from the ureters to a stoma. Urine drains continuously, so pouches use a tap or bung rather than a faecal drainable closure.

Named operations such as a Hartmann’s procedure (often leaving an end colostomy) or a mucous fistula describe how the bowel was divided. They are not separate pouch “types”.

Temporary, permanent, end and loop

A temporary ostomy is intended for later reversal (closure). A permanent ostomy is expected to be lifelong. “Temporary” is a surgical intention, not a guaranteed date.

An end stoma is formed from a single cut end of bowel or conduit, usually matured as a small spout. A loop stoma is made by bringing a loop of bowel to the surface and opening it, so proximal and distal openings sit close together. Loop stomas are often chosen when diversion may be reversed, but they can also remain long term. Only the operating team and stoma care nurse can advise whether reversal is realistic for you.

Anatomy around the stoma

The stoma and peristomal skin

The stoma is moist red or pink mucosa. It does not sense sharp pain as skin does, although the surrounding abdomen can be sore. The lumen is the hole through which output passes.

Peristomal skin is the skin immediately around the stoma, usually under the adhesive barrier. The mucocutaneous junction is the seam where mucosa meets skin. Mucocutaneous separation means that seam has partly pulled apart during early healing; it is assessed by the clinical team.

A budded or spouted stoma stands slightly proud of the skin, which can help output drop into the pouch. A flush stoma sits level with the skin. A retracted stoma sits below skin level and may be more prone to leakage under the barrier.

Surgical landmarks and related terms

Peristomal means around the stoma. A parastomal hernia is a bulge from abdominal contents pushing through weakened muscle beside the stoma.

An anastomosis is a surgical join between two sections of bowel or other hollow organs. After reversal there is no stoma, although bowel habit may still change.

IBD (inflammatory bowel disease) includes Crohn’s disease and ulcerative colitis, two conditions that sometimes lead to ostomy surgery. Ostomies are also formed for cancer, diverticular disease, injury, congenital conditions and bladder disease.

Pouching systems and accessories

A pouching system (appliance) collects output. It has a skin barrier (also called a baseplate, wafer or flange) that adheres to and protects the skin, and a pouch that holds effluent.

One-piece and two-piece appliances

In a one-piece system the barrier and pouch are a single unit and come off together. In a two-piece system the barrier can stay on the skin while pouches are detached. Neither design is universally better; fit depends on the stoma, the abdomen, output and preference, guided by a stoma care nurse.

Pouches may be closed (removed when soiled, mainly for more formed colostomy output), drainable (emptied through a tail, typical for ileostomy), or urostomy pouches with a tap. Many faecal pouches include a filter to vent flatus (gas). A wet filter is one cause of ballooning, when the pouch inflates.

Convexity, seals and other generic components

Convexity is a barrier that curves in towards the stoma. It is sometimes used for a flush or retracted stoma, or for soft abdominal contours, when a flat barrier leaks. Convexity is not suitable for every abdomen and should be chosen with a specialist nurse, because excess pressure can injure skin or mucosa.

A barrier ring or seal is a mouldable ring used to fill dips and improve the fit. Paste is a filler, not a glue. Adhesive remover helps take a barrier off without skin stripping (mechanical damage from peeling).

A stoma measuring guide is a card of circles used to size the hole in the barrier. The opening should match the stoma closely without cutting mucosa, leaving as little exposed skin as possible. Size often changes in the weeks after surgery, so remeasuring is part of routine review. Belts, adhesive extenders and urostomy night bags exist in generic form; none is required for every person.

Output, function and everyday care

Effluent, flatus and wear time

Effluent or output is whatever leaves the stoma. Pancaking is formed stool lodging at the top of a pouch so it does not drop down or it blocks the filter. It is a practical nuisance, not a disease.

Wear time is how long a barrier stays intact without leakage or skin harm. There is no single correct number of days. Heat, activity and high output commonly shorten wear time.

Emptying a drainable pouch before it becomes heavy is widely taught, because weight pulls on the seal. Exact routines, including fluids when output is high, should be agreed with a clinician rather than copied from informal advice.

High output and irrigation

A high-output stoma usually means an ileostomy producing much more fluid than typical. It can cause dehydration and electrolyte imbalance and needs prompt clinical review, not self-directed fluid loading or attempts to “acidify” output.

Colostomy irrigation is a wash-out method used by some people with a descending or sigmoid colostomy to regulate emptying. It is taught individually, is not suitable for every colostomy, and is not used for ileostomy or urostomy. Do not attempt it unless a stoma care nurse has assessed and trained you.

Night drainage means connecting a urostomy pouch to a larger bedside bag so it does not overfill during sleep.

Complications and skin terms

Photographs online are a poor substitute for examination. Many of the problems below are manageable when recognised early. Always consult your stoma care nurse or clinician before treating skin, changing pouching technique, or interpreting a new bulge, colour change or pain.

Structural problems of the stoma

Prolapse is bowel telescoping so the stoma becomes longer than usual. Stenosis is narrowing of the lumen. Necrosis is tissue death, most relevant in the first days after surgery if the stoma looks dark; that is an urgent postoperative concern. Granulomas (including overgranulation) are small, often friable lumps on the stoma or junction that may bleed on contact; treatment is a clinical decision.

Peristomal skin conditions

Peristomal moisture-associated skin damage is irritation from output sitting on the skin, often under a leaking barrier. Medical adhesive-related skin injury is damage from adhesives or from removal. Contact dermatitis may relate to an ingredient in a barrier or accessory. Candidiasis is a yeast infection of warm, moist skin. Folliculitis is inflammation of hair follicles. Pyoderma gangrenosum is an uncommon, painful ulcerating condition linked with inflammatory disease and needs specialist diagnosis.

If skin is broken and spreading, there is fever, bleeding is heavy, or output stops unexpectedly, use the contact route given in your discharge advice — stoma care nurse, surgical team or emergency services.

A stoma care nurse (stoma nurse specialist or clinical nurse specialist in stoma care) is the usual first contact for fitting, education and troubleshooting. Ask whenever a clinic letter uses a word you do not recognise; shared vocabulary helps the team act on what you report.

The bottom line

Ostomy language is practical. Knowing whether a stoma is loop or end, a pouch drainable or closed, or whether skin damage is from moisture or from adhesive, makes clinical conversations safer and shorter. This glossary follows mainstream UK and international usage, but it cannot replace an examination of your own stoma. Keep a note of the words your nurse uses for your appliance and skin, and take unanswered questions to your stoma care nurse or clinician rather than experimenting alone.