Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Ostomy surgery and post-operative care should be managed in close consultation with your surgeon, gastroenterologist, and a Certified Wound Ostomy Continence Nurse (CWOCN). Individual circumstances vary significantly — always follow the guidance of your healthcare team.
Each year, approximately 100,000 people in the United States have ostomy surgery. If you or a loved one is facing ostomy surgery — or has recently had one — understanding the difference between the two most common types, colostomy and ileostomy, is an important first step in adapting to life with an ostomy.
At AllCare Store, we carry a complete selection of ostomy supplies — pouching systems, skin barriers, accessories, and more — to support ostomates at every stage. This guide covers everything you need to know about colostomy vs ileostomy: anatomy, differences, care requirements, and what to expect.
What Is an Ostomy?
An ostomy is a surgical procedure that creates an opening (called a stoma) in the abdominal wall, allowing waste to exit the body through an alternative route. The stoma connects to a section of the intestine and is covered by a pouching system worn on the outside of the body.
Ostomies are created for a variety of medical reasons, including colorectal cancer, Crohn’s disease, ulcerative colitis, diverticulitis, bladder cancer, bowel trauma, and certain congenital conditions. An ostomy may be temporary (with plans for reversal once the bowel heals) or permanent, depending on the underlying condition and surgical approach.
There are three main types of intestinal ostomy: a colostomy (large intestine diverted to a stoma), an ileostomy (small intestine diverted to a stoma), and a urostomy (urinary tract diverted to a stoma — not covered in this guide).
Anatomy Review: Colon vs Ileum
Food enters the stomach, then moves into the small intestine — a roughly 20-foot tube where most nutrient absorption occurs. The last portion is the ileum, which connects to the large intestine (colon). The colon’s primary job is water reabsorption: it transforms liquid stool into solid form as it moves through the ascending, transverse, descending, and sigmoid colon before reaching the rectum. This anatomy explains the key practical differences between the two ostomy types.
What Is a Colostomy?
A colostomy diverts part of the large intestine (colon) to a stoma. Colostomies are named for the part of the colon involved: ascending colostomy (right colon, liquid output, relatively rare), transverse colostomy (mid-colon, semi-formed output, often temporary), and descending/sigmoid colostomy (the most common type, lower left colon, typically produces formed or semi-formed stool similar to a normal bowel movement).
Common reasons for colostomy include colorectal cancer (especially rectal cancer requiring abdominoperineal resection), diverticulitis with perforation (Hartmann’s procedure), bowel obstruction, colon or rectal trauma, inflammatory bowel disease, and rectal prolapse. The stoma is typically round or oval, moist and pink-red, with slight protrusion, and located on the left side of the abdomen for sigmoid/descending colostomies.
What Is an Ileostomy?
An ileostomy diverts the small intestine (ileum) to a stoma. Because waste exits before reaching the colon, water reabsorption is bypassed — meaning output is liquid to paste-like and continuous rather than at predictable intervals.
The most common type is an end ileostomy (Brooke ileostomy), where the end of the ileum is brought through the abdominal wall. A loop ileostomy creates a two-opening stoma and is usually temporary, placed to protect a downstream surgical join. A continent ileostomy (Kock pouch) uses an internal pouch drained by catheter rather than an external pouch.
Common reasons for ileostomy include ulcerative colitis (total proctocolectomy), Crohn’s disease affecting the colon, familial adenomatous polyposis (FAP), and colorectal cancer requiring removal of the entire colon. The ileostomy stoma typically protrudes further from the abdomen (1–2 cm) to direct liquid output into the pouch and away from the skin, and is most often located on the right side of the abdomen.
Key Differences: Colostomy vs Ileostomy
| Feature | Colostomy | Ileostomy |
|---|---|---|
| Intestine diverted | Large intestine (colon) | Small intestine (ileum) |
| Typical location | Left side of abdomen | Right side of abdomen |
| Output consistency | Semi-formed to formed (sigmoid); liquid (ascending) | Liquid to paste-like, continuous |
| Output frequency | Predictable intervals | Continuous; 4–8 empties/day |
| Skin irritation risk | Lower | Higher (enzyme-rich output) |
| Dehydration risk | Lower | Higher (colon water absorption lost) |
| Irrigation possible? | Yes (sigmoid/descending only) | No |
| Common conditions | Colorectal cancer, diverticulitis | Ulcerative colitis, Crohn’s, FAP |
Ostomy Supplies: What You’ll Need
Both colostomies and ileostomies require a pouching system worn over the stoma. One-piece systems integrate skin barrier and pouch in a single unit — easier to apply and lower profile. Two-piece systems have a separate barrier and pouch that clicks on and off — the barrier may stay in place several days while the pouch is changed, preferred by many ileostomates for flexibility.
Closed pouches (sealed at the bottom, discarded when full) suit sigmoid colostomies producing formed output. Drainable pouches (fold-up outlet for emptying and resealing) are essential for ileostomies and ascending/transverse colostomies with liquid output. Additional accessories — stoma paste, barrier rings, skin prep wipes, adhesive remover, deodorant drops, and ostomy belts — support peristomal skin health and comfort. Browse our full range of ostomy supplies at AllCare Store.
Managing Common Challenges
Peristomal Skin Problems (More Common with Ileostomy)
Liquid ileostomy output is enzyme-rich and quickly erodes peristomal skin if it contacts the skin under the barrier. Prevention requires a precise barrier opening (no larger than 1/8 inch around the stoma), appropriate barrier type, and barrier ring or stoma paste to fill skin irregularities. Contact your CWOCN promptly if skin problems develop.
Dehydration and Electrolyte Imbalance (Ileostomy)
Because the colon’s water reabsorption is bypassed, ileostomates lose significantly more fluid and electrolytes. Drink at least 8–10 cups of fluid daily, choose electrolyte-containing beverages, and monitor output. Output consistently exceeding 1,200–1,500 mL/day warrants contact with your care team. Oral rehydration solutions (ORS) are more effective than plain water for replacing electrolytes.
Diet Adjustments
Ileostomy users should introduce high-fiber foods cautiously (whole nuts, raw vegetables, corn, mushrooms can cause blockages) and chew thoroughly. Colostomy users with formed output can generally return to a normal diet, though gas-producing foods may increase pouch ballooning. Certain foods affect odor (fish, eggs, garlic, asparagus) in both types, while yogurt and cranberry juice may help reduce it.
Blockages (More Common with Ileostomy)
Signs include cramping, abdominal distension, watery output bypassing a blockage, or no output. Mild blockages may resolve with dietary modification, increased fluids, and a warm bath. Seek emergency care if output stops entirely or if severe pain, nausea, or vomiting develops.
Colostomy Irrigation
Individuals with a sigmoid or descending colostomy may qualify for colostomy irrigation — instilling warm water through the stoma to stimulate a controlled evacuation. When effective, many individuals can go 24–48 hours between natural outputs, wearing only a small stoma cap. Must be learned with CWOCN guidance. Not possible with ileostomies or ascending/transverse colostomies.
Shop Ostomy Supplies at AllCare Store
AllCare Store carries a comprehensive selection of ostomy pouching systems, skin barriers, accessories, and care products with free shipping on every order. Visit our ostomy supplies collection at AllCare Store, or call 1-888-889-6260 with any questions.
