What is an intra-abdominal abscess?

An intra-abdominal abscess is a pocket of infected fluid or pus that forms inside the abdomen. It happens when bacteria cause infection and inflammation within the tissues or organs in the belly.

These abscesses can develop near the intestines, stomach, liver, or other abdominal organs. Several conditions can increase the risk of developing an abscess in the abdomen. Common causes and risk factors include:

• Recent abdominal surgery
• Injury or trauma to the abdomen
• Appendicitis
• Diverticulitis
• Bowel perforation
• Inflammatory bowel disease
• Diabetes
• Infections caused by bacteria from the digestive tract

Because these infections can become serious quickly, it’s important to seek medical care if symptoms worsen or do not improve.

Symptoms

Symptoms of an intra-abdominal abscess can range from mild discomfort to severe illness. Some symptoms may develop gradually over time.

Common symptoms include:

• Fever or chills
• Belly pain or tenderness
• Nausea and vomiting
• Loss of appetite
• Bloating or changes in bowel movements
• Fatigue or weakness
• Pain that spreads to the chest or shoulder in some cases

How is it diagnosed?

Healthcare providers diagnose an intra-abdominal abscess using a combination of a physical exam, medical history, and imaging tests.

Blood tests can help show signs of infection or inflammation. A CT scan is often the most effective way to locate an abscess and determine its size. In some cases, ultrasound or MRI may also be used.

Your provider may also check for abdominal tenderness, swelling, or other signs of infection during an exam.

How is it treated?

Treatment focuses on clearing the infection and removing the trapped fluid.

Antibiotics are usually started first to help control the infection. Most abscesses also need to be drained. This is often done with a minimally invasive procedure using imaging guidance to place a needle or small tube into the abscess.

Some people may need surgery, especially if the abscess is large or related to another abdominal condition that needs repair. In more severe cases, temporary nutritional support may be part of recovery.

Early treatment can help prevent complications and improve healing. Recovery time depends on the cause of the infection, overall health, and how quickly treatment begins.