Peritonitis is not simply “abdominal pain.” It is inflammation and infection of the lining of the abdominal cavity (the peritoneum), usually caused by leakage of bacteria, bowel contents, pus, bile, stomach acid, or infected fluids into the abdomen. Once this happens, the body can rapidly progress into sepsis, shock, organ failure, and death if treatment is delayed.
What makes peritonitis especially dangerous is that the infection is trapped inside the abdomen, where it continuously spreads inflammation throughout the body. The patient may look critically ill very quickly.
What Exactly Is Peritonitis?
Peritonitis means inflammation of the peritoneum — the thin membrane lining the abdominal cavity and covering the abdominal organs.
This inflammation can be caused by:
Bacteria
Fungi
Viruses
Bowel contents leaking into the abdomen
Blood
Bile
Pancreatic enzymes
Foreign materials
Drugs or chemicals
Once the peritoneum becomes inflamed, the entire body reacts aggressively. Fluid leaks out of blood vessels, the intestines stop moving normally, toxins enter the bloodstream, and severe sepsis can develop.
That is why peritonitis is considered a true medical and surgical emergency.
The Different Types of Peritonitis
Understanding the type of peritonitis helps doctors determine the source and treatment.
1. Primary Peritonitis (Spontaneous)
This happens without a hole in the bowel.
The infection usually spreads through the bloodstream or lymphatic system.
It commonly occurs in:
People with liver cirrhosis and ascites
Children with nephrotic syndrome
Immunocompromised patients
Common bacteria include:
E. coli
Gram-positive cocci
Anaerobes
Treatment is mainly:
Antibiotics
IV fluids
Monitoring for sepsis
2. Secondary Peritonitis (Most Common)
This occurs when something inside the abdomen leaks or ruptures.
Common causes include:
Perforated peptic ulcer
Ruptured appendix
Typhoid intestinal perforation
Bowel obstruction with necrosis
Diverticulitis
Colon cancer perforation
Advertisement Traumatic bowel injury
Anastomotic leak after surgery
This type is especially dangerous because bacteria, digestive enzymes, and stool can flood the abdominal cavity.
3. Tertiary Peritonitis
This is persistent or recurrent infection despite treatment.
It often occurs in critically ill ICU patients whose immune systems are weak.
These patients may continue deteriorating even after surgery and antibiotics.
What Happens Inside the Body?
Peritonitis triggers a massive inflammatory response.
The body tries to isolate the infection, but when the infection spreads:
Blood vessels become leaky
Fluid leaves the circulation
Blood pressure falls
The intestines become paralyzed (ileus)
Bacteria and toxins spread into the bloodstream
Organs begin failing
This is how abdominal infection becomes septic shock.
Symptoms People Commonly Notice
The most important symptom is abdominal pain.
But unlike ordinary stomach pain, this pain is:
Severe
Constant
Worse with movement
Often associated with guarding or rigidity
Many patients lie very still with knees bent because movement worsens the pain.
Other symptoms include:
Fever
Vomiting
Abdominal swelling
Inability to pass stool or gas
Nausea
Loss of appetite
Weakness
Rapid heartbeat
Difficulty breathing
In severe sepsis:
Confusion may develop
Blood pressure may fall dangerously low
The patient may become cold instead of feverish
Signs Doctors Look For During Examination
Doctors rely heavily on physical examination because peritonitis is mainly a clinical diagnosis.
Important signs include:
Abdominal Tenderness
Pain occurs even with gentle touch.
Guarding and Rigidity
The abdominal muscles tighten involuntarily because the inflamed peritoneum is extremely irritated.
This is one of the classic “surgical abdomen” signs.
Rebound Tenderness (Blumberg Sign)
Pain becomes worse when the hand is suddenly released after pressing the abdomen.
This suggests peritoneal irritation.
Reduced Bowel Sounds
The intestines often stop moving normally during severe inflammation.
Signs of Shock
Doctors also watch for:
Fast pulse
Low blood pressure
Cold extremities
Reduced urine output
Confusion
These suggest sepsis and poor organ perfusion.
The Most Dangerous Causes
Some causes are particularly deadly if treatment is delayed.
Perforated Peptic Ulcer
Stomach acid and bacteria leak directly into the abdomen.
Patients may suddenly develop:
Severe epigastric pain
Board-like abdominal rigidity
Shock
Air under the diaphragm may be seen on an upright chest X-ray.
Typhoid Intestinal Perforation
Very important in many African and Asian countries.
The intestine becomes inflamed and necrotic, then perforates.
Patients often present late with:
Fever
Severe abdominal pain
Distension
Septic shock
Ruptured Appendix
Appendicitis may start localized, but delayed treatment can lead to generalized peritonitis.
Anastomotic Leak After Surgery
One of the most feared postoperative complications.
Intestinal contents leak through the surgical connection site into the abdomen.
How Peritonitis Is Diagnosed
The diagnosis is mostly clinical.
Doctors should not delay life-saving treatment waiting endlessly for tests.
However, some investigations help identify the source and complications.
Blood Tests
Doctors commonly check:
White blood cell count
Hemoglobin
Electrolytes
Lactate
Kidney function
Blood cultures
High lactate may suggest severe sepsis or shock.
X-rays
An upright chest X-ray may show free air under the diaphragm in bowel perforation.
This is especially common in perforated duodenal ulcers.
CT Scan
CT abdomen is very useful when:
Diagnosis is uncertain
There may be abscesses
Postoperative complications are suspected
But in an obvious surgical emergency, CT should not dangerously delay surgery.
Ultrasound
Useful especially:
At bedside
In unstable patients
For detecting fluid collections
For guided drainage procedures
The Three Main Principles of Treatment
The classic surgical principles are simple but lifesaving:
Eliminate the source of infection
Remove dead tissue and pus
Drain infected collections
Everything in management revolves around these goals.
Emergency Resuscitation Comes First
Before surgery, critically ill patients must be stabilized aggressively.
IV Fluids
Large amounts of fluids may be required because severe infection causes massive fluid loss into tissues.
Doctors monitor:
Blood pressure
Urine output
Heart rate
Mental status
Target urine output is usually:
0.5\ \mathrm{mL/kg/hr}
Oxygen and Ventilation
Some patients require:
Oxygen therapy
Mechanical ventilation
ICU care
Low tidal volume ventilation is commonly used in critically ill patients.
Blood Pressure Support
If fluids alone are insufficient, vasopressors may be needed to maintain blood pressure.
The usual target mean arterial pressure is:
MAP > 65\ \mathrm{mmHg}
Antibiotics Must Be Started Early
Antibiotics should be started as soon as possible.
The choice depends on the likely source.
Upper GI Perforations
Usually involve mainly gram-positive organisms.
Common options include:
Cephalosporins
Penicillins
Colon or Distal Small Bowel Perforation
Usually polymicrobial.
Coverage often includes:
Gram-negative bacteria
Anaerobes
Enterococci
Common organisms include:
E. coli
Klebsiella
Proteus
Bacteroides fragilis
Pseudomonas
If fungal infection is suspected, antifungal therapy may also be added.
Surgery Is Often the Definitive Treatment
Many patients cannot survive without surgery.
The operation aims to:
Stop ongoing contamination
Repair or remove perforated bowel
Wash out pus and stool
Drain infected collections
What Surgeons Commonly Do
Depending on the cause:
Perforated Ulcer
Repair the perforation
Wash out the abdomen
Gangrenous Bowel
Remove dead bowel
Reconnect healthy bowel if safe
Severe Colon Contamination
Sometimes a temporary colostomy is safer than reconnecting the bowel immediately.
Abdominal Lavage (“Washout”)
Large amounts of warm saline are used to wash the abdomen until the returning fluid becomes clear.
Areas carefully cleaned include:
Pelvis
Subphrenic spaces
Paracolic gutters
This helps reduce bacterial load and prevent abscess formation.
Complications Doctors Fear Most
Peritonitis can rapidly become fatal.
Major complications include:
Septic shock
Multi-organ failure
Respiratory failure
Kidney failure
Abscess formation
Anastomotic leak
Disseminated intravascular coagulation (DIC)
Abdominal compartment syndrome
Why Some Patients Continue Deteriorating Even After Surgery
Sometimes the infection persists because:
The source was missed
There is ongoing leakage
Abscesses formed later
The immune system is severely weakened
These patients may require:
Repeat surgery
ICU support
Drainage procedures
Stronger antibiotics
Nutrition Is Extremely Important
Critically ill patients break down muscle rapidly.
Whenever possible:
Enteral feeding (through the gut) is preferred
Nutritional support should start early
Good nutrition improves healing and immunity.
What Should Never Be Ignored
Seek urgent medical care immediately if abdominal pain is associated with:
Fever
Vomiting
Severe tenderness
Abdominal rigidity
Inability to pass stool or gas
Fainting
Low blood pressure
Confusion
Rapid worsening symptoms
These may indicate peritonitis or sepsis.
Quick Decision Guide
Mild stomach pain only
May not be peritonitis
Observe carefully
Hydrate
Seek evaluation if worsening
Severe abdominal pain with tenderness or fever
Needs urgent medical assessment
Do NOT self-medicate repeatedly at home
Rigid abdomen, severe weakness, vomiting, collapse, or confusion
Emergency
Go to hospital immediately
Surgery and ICU care may be lifesaving
The Most Important Takeaway
Peritonitis is one of the deadliest abdominal emergencies because infection inside the abdomen can spread rapidly into the bloodstream and cause shock, organ failure, and death.
The biggest mistake is delay.
Early recognition, rapid resuscitation, antibiotics, and timely surgery are what save lives.
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