17718 Pseudomembranous Colitis

Overview

Pseudomembranous colitis is inflammation of the large intestine (colon) caused by an overgrowth of bacteria called Clostridium difficile, or C. diff. This bacteria can produce toxins that damage the lining of the gut, leading to diarrhea, belly pain, and fever. It most often happens after taking antibiotics, which can disrupt the natural balance of bacteria in the bowel.

It is fairly common, especially among people who are in the hospital or have recently taken antibiotics. It is one of the leading causes of diarrhea in healthcare settings.

Pseudomembranous colitis can affect anyone, but it is more common in older adults, people staying in hospitals or nursing homes, people with weakened immune systems, and those who have recently completed a course of antibiotics.

Symptoms

Common symptoms

• Watery diarrhea (often three or more times a day for two or more days)
• Mild to severe belly cramping and pain
• Fever
• Nausea
• Loss of appetite
• Mucus or blood in the stool

Symptoms in children

• Diarrhea
• Crankiness or irritability
• Poor feeding or refusal to eat
• Belly pain and bloating
• Signs of dehydration, such as dry mouth, fewer wet diapers, or sunken eyes

Symptoms in older adults

• The same common symptoms as anyone else, but often more severe
• Confusion or feeling unusually sleepy
• Rapid heartbeat
• Low blood pressure
• Severe dehydration and weakness

Causes

Main causes

• Treatment with antibiotics, especially broad-spectrum antibiotics that kill many types of bacteria, can upset the normal balance in the gut, allowing C. diff to overgrow.
• C. difficile bacteria are present in the environment, often in hospitals, and produce spores that are hard to kill.
• The bacteria release toxins that damage the lining of the colon, causing inflammation and the membrane-like patches that give the condition its name.

Risk factors

• Recent use of antibiotics
• Being 65 years of age or older
• Staying in a hospital or long-term care facility
• A weakened immune system from illness or certain medicines
• Use of stomach acid-reducing drugs (such as proton pump inhibitors)
• A previous episode of C. diff infection
• Certain bowel conditions, such as inflammatory bowel disease

When to see a doctor

See a doctor urgently if:

• You develop severe belly pain, blood in your stool, or a very high fever.
• You have diarrhea that is severe, watery, and frequent, especially if it's making you feel faint or dizzy.
• You are an older adult, a young child, or have a weak immune system and notice any symptoms.

Book a routine appointment if:

• You had a recent course of antibiotics and have had watery diarrhea for more than two days.
• Mild diarrhea keeps coming back after finishing treatment.
• You have ongoing belly cramps or tenderness that isn't getting better.

Diagnosis

Your healthcare provider will review your symptoms, recent antibiotic history, and any recent hospital stays. They will generally order a stool test to look for C. difficile toxins, and sometimes a blood test or imaging to check for complications.

Tests that may be done

• Stool test for C. difficile toxins
• Stool culture to grow the bacteria
• Blood tests to check for signs of infection, dehydration, or kidney problems
• CT scan or X-ray of your abdomen if severe inflammation is suspected
• A flexible sigmoidoscopy or colonoscopy (in rare cases) to look directly at the lining of the colon

What to expect at your appointment

Most people start with a stool test. You'll be asked to provide a small sample, which is sent to a lab. Results usually come back within one to three days. While waiting, you may be given fluids to prevent dehydration, and your doctor will decide if treatment should begin before the results are ready.

Treatment

The first step is usually to stop the antibiotic that triggered the problem, if possible. Then your healthcare team will treat the C. diff infection, often with a different kind of antibiotic that specifically targets the C. diff bacteria. You may also receive fluids to replace what you've lost. In a severe case, you might need care in the hospital.

Self-care at home

• Drink plenty of fluids such as water, clear broth, or oral rehydration solutions to stay hydrated.
• Rest as much as possible to help your body recover.
• Wash your hands thoroughly with soap and water, especially after using the toilet, to avoid spreading the infection.
• Do not take anti-diarrheal medicines without first talking to your doctor, as they can make the infection worse.
• Follow your doctor's instructions about any antibiotics or other medicines you are taking.

Medical treatments

Your doctor may prescribe a course of antibiotics that is effective against C. difficile. These are usually taken by mouth for about 10 to 14 days. In some cases, doctors might use other approaches, such as a stool transplant, to help restore healthy gut bacteria. Treatment is always tailored to how severe your symptoms are and your overall health.

When is surgery considered?

Surgery is rare and is only considered in very severe cases where the colon is severely damaged, has a hole in it, or medication is not working. The operation removes the diseased part of the colon to save the person's life.

Living with this condition

Recovery can take time. You may feel tired for several weeks. Keep taking any prescribed medicines exactly as directed. Let your household know about the infection so they can be careful about handwashing and cleaning, especially in the bathroom. Stay in touch with your doctor until you feel fully better.

Lifestyle tips

• Wash your hands with soap and water frequently, especially before eating and after using the toilet.
• Clean surfaces like door handles, faucets, and toilet seats with a bleach-based disinfectant (or what your local health service recommends).
• Avoid unnecessary antibiotics in the future, and always ask your doctor if they are truly needed.
• Let your healthcare team know you've had C. diff in the past before any hospital admission.

Diet and exercise

Eat bland, gentle foods like rice, bananas, toast, and cooked vegetables while your gut heals. Avoid creamy, greasy, spicy, or very high-fibre foods for a while. Drink water and clear fluids regularly. Once you feel better, you can slowly return to your normal diet. Light activity like short walks can help regain strength, but avoid heavy exercise until you've recovered.

Mental health and emotional wellbeing

Living through a bout of infectious diarrhoea can be stressful, and some people worry about the illness coming back. It's normal to feel anxious or frustrated. Talk to your healthcare team about these feelings, and don't hesitate to ask for support from family or friends. Focus on small wins each day, like being able to eat a meal or go for a walk.

Prevention

Yes, many cases are preventable. The most important steps are using antibiotics only when needed, practicing good hand hygiene (especially in healthcare settings), and cleaning surfaces properly. Hospitals and nursing homes have infection-control policies to reduce the spread of C. diff.

Complications

If left untreated

• Severe dehydration, which can lead to kidney damage or failure
• A severely swollen colon (toxic megacolon)
• A hole in the colon (perforation), which is a life-threatening emergency
• Sepsis, a severe whole-body infection
• Recurrence of the infection after treatment, which happens in about 1 in 5 people

Long-term outlook

With early and proper treatment, most people with pseudomembranous colitis recover completely. Even if the infection returns, doctors have effective strategies to manage it. The key is to seek medical care quickly if symptoms appear, especially after antibiotics or a hospital stay.

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