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Peritonitis

Also called: Peritonitis

Infection or inflammation of the belly lining, often from a burst appendix or ulcer, causing severe belly pain and a hard belly.

SignsRigid belly, pain with movement

Overview

People on peritoneal dialysis can get it from their catheter.

Symptoms

Common signs:

  • Severe belly pain
  • Hard, tender belly
  • Fever

Less common

  • Vomiting

When to get medical care

Call 911Call 911 now for: severe belly pain, hard, tender belly, fever.
Get care todayMilder symptoms that could be early signs.
See a doctor soonQuestions about lowering your risk.

Causes

Burst organ, infection.

Does it spread or run in families?

  • It isn't caught from someone else. It's caused by germs that already live on or in the body.

Who is more likely to get it

  • Peritoneal dialysis

Possible complications

  • Sepsis: Infection spreading into the blood

Diagnosis

This is diagnosed in the emergency room or hospital.

The exam

A physical exam.

Tests

Tests, if needed:

  • CT:

Treatment

Emergency care is needed. While waiting for help:

Self-care

  • Don't eat or drink
  • Go to the ER

Prevention

To lower your risk or prevent problems:

  • Treat appendicitis fast
  • Keep dialysis catheters clean

Which doctor treats this

  • Emergency doctors treat it first, in the ER.
  • They may send you to an infectious disease specialist, for hard-to-treat infections.

Back to school, work, or sports

  • Recovery time varies. Ask your care team when you can drive, lift, work, and exercise.

Children, pregnancy, and older adults

  • People on peritoneal dialysis: Higher risk.

Pregnancy and breastfeeding

  • If you're pregnant or planning to be, tell your prenatal provider about this condition.
  • Some infections can pass to the baby during pregnancy or birth. Tell your provider if you've been exposed.
  • Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
  • Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
  • Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.

For caregivers

  • Go to visits when you can and take notes.
  • Keep a list of medicines, allergies, and doctors in one place.
  • Learn the warning signs that need fast care.
  • Learn CPR. Many hospitals and the Red Cross offer classes.
  • Take breaks and ask for help. Caregivers need care too.

Outlook

Fast treatment improves recovery.

Fast treatment saves lives.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

  • A list of your medicines and supplements
  • Notes on when symptoms started and what makes them better or worse

Questions to ask

  • What follow-up care do I need?
  • How can I prevent this from happening again?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Peritonitis

Sources

Last updated 2026-11-12.