Spontaneous Bacterial Peritonitis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Spontaneous Bacterial Peritonitis?
An infectious disease specialist usually helps manage this condition, often with a team that may include a liver specialist called a hepatologist, a hospital doctor, and the patient's regular doctor. The specialist helps choose the antibiotic and how long treatment lasts.
What it is
Spontaneous bacterial peritonitis is an infection of the fluid inside the belly. The peritoneum is the thin tissue lining the abdomen. Fluid can build up there and get infected without any outside cause, such as a wound or surgery. The condition is serious and happens most often in people with liver disease.
Symptoms
The most common signs are belly pain, a swollen or tight belly, and fever. Some people feel sick to their stomach or throw up; others notice confusion or unusual tiredness. If you have liver disease and your belly suddenly hurts or swells, get medical care right away.
Causes and who gets it
Doctors believe bacteria move from the gut into fluid that has collected in the belly. People with cirrhosis, long-term scarring of the liver, are at highest risk, and fluid called ascites often builds up as a result. Low protein levels in that fluid and digestive tract bleeding also raise risk.
How doctors diagnose it
The main test is paracentesis, in which a doctor uses a thin needle to remove a sample of fluid from the belly. Lab staff check the white blood cell count; a high count points to infection, and the lab can grow the bacteria to identify the germ.
Treatment
Treatment uses antibiotics. Doctors often start with a broad antibiotic, then adjust it once lab results show which germ is present. Many people also receive an albumin infusion to support blood flow and kidney function. Care usually starts in a hospital, and a long-term antibiotic is often prescribed afterward to prevent recurrence.
When to see a doctor
Anyone with liver disease who has new belly pain, fever, confusion, or a quickly swelling belly should seek care the same day, because this infection can worsen fast. Severe symptoms such as intense pain, repeated vomiting, or marked confusion need emergency care.
How a direct primary care or concierge doctor fits in
A direct primary care doctor is paid a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works alongside insurance. Either can watch for fluid buildup and manage long-term medicines, but when the infection is suspected the patient needs hospital care and a specialist right away.
Common questions
Is spontaneous bacterial peritonitis contagious?
No. The germs come from the person's own gut, not from another person. You cannot catch it from someone or pass it to family members.
Can it come back after treatment?
Yes, it can return. This is why doctors often prescribe a long-term preventive antibiotic for people at high risk. Regular follow-up visits matter. Your doctor will explain the plan for your situation.
Is the paracentesis test painful?
Most people feel a sting from the numbing medicine and some pressure when the needle goes in. The test is usually quick. Tell the doctor if you feel pain so they can help.
Can it be prevented?
People with cirrhosis and fluid in the belly can lower their risk with regular checkups and, in some cases, preventive antibiotics. Avoiding alcohol and getting advised vaccines also support liver health. Talk with your doctor about what makes sense for you.
Sources
- MedlinePlus - Peritonitis - spontaneous bacterial: MedlinePlus Medical Encyclopedia
- MedlinePlus - Peritonitis: MedlinePlus Medical Encyclopedia
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
