What Is Appendicitis?

Appendicitis is inflammation and infection of the appendix, a small finger-shaped pouch attached to the large intestine. It usually causes abdominal pain, nausea, vomiting, and fever. Without prompt treatment, appendicitis can lead to serious complications such as a burst appendix, abscess formation, and widespread infection in the abdomen.

Appendicitis is one of the most common causes of emergency abdominal surgery worldwide and can affect both children and adults.

Surgery to remove the appendix (appendicectomy) remains the gold-standard and definitive treatment for most patients.

Appendicitis At A Glance

• Appendicitis is inflammation of the appendix.

• It commonly causes pain in the lower right side of the abdomen.

• Symptoms may include nausea, vomiting, fever, and loss of appetite.

• Appendicitis can initially be mistaken for food poisoning or gastroenteritis.

• Untreated appendicitis can result in rupture (burst appendix).

• Surgery is the definitive treatment for most patients.

• Early diagnosis significantly reduces the risk of complications.

• Most patients recover well after laparoscopic (keyhole) surgery.

Key Facts About Appendicitis

• Approximately 1 in 20 people will develop appendicitis during their lifetime.

• Appendicitis is one of the most common surgical emergencies worldwide.

• It most frequently affects individuals between 10 and 30 years of age.

• Delayed treatment increases the risk of perforation and infection.

• Modern laparoscopic surgery allows faster recovery and smaller scars.

• Most patients make a full recovery following treatment.

Understanding the Appendix

The appendix is a small tube-like structure attached to the beginning of the large intestine.

Although the appendix may have some minor immune-related functions, it is not essential for normal digestion or daily life. People can live completely normal and healthy lives after the appendix has been removed.

What Causes Appendicitis?

Appendicitis occurs when the appendix becomes blocked and inflamed.

Possible causes include:

• Hardened stool (faecolith)

• Infection within the digestive tract

• Enlarged lymph nodes

• Inflammation affecting the bowel

• Rarely, growths or tumours

When the appendix becomes blocked, bacteria multiply inside it, causing swelling, infection, and increasing pressure. If untreated, the appendix may eventually rupture.

What Are the Symptoms of Appendicitis?

Symptoms can vary between patients but commonly include:

• Pain that starts near the belly button

• Pain that later moves to the lower right side of the abdomen

• Increasing abdominal pain over several hours

• Pain that worsens when walking, coughing, or moving

• Loss of appetite

• Nausea

• Vomiting

• Fever

• Bloating

• Constipation or diarrhoea

• Feeling generally unwell

Not every patient experiences the classic pattern of symptoms.

Children, elderly patients, and pregnant women may present differently, making medical evaluation particularly important.

Can Appendicitis Be Mistaken for Food Poisoning or Gastroenteritis?

Yes.

In the early stages, appendicitis may resemble:

• Food poisoning

• Gastroenteritis ("stomach flu")

• Indigestion

• Urinary tract infection

• Kidney stones

• Certain gynaecological conditions

Many patients initially believe they have a simple stomach upset.

However, unlike gastroenteritis, appendicitis pain often becomes progressively worse and localises to the lower right side of the abdomen.

Persistent or worsening abdominal pain should always be assessed by a doctor.

How Is Appendicitis Diagnosed?

Accurate diagnosis is important because untreated appendicitis can lead to serious complications.

Medical History

Your doctor will ask about:

• The location of your pain

• When symptoms started

• Whether the pain is worsening

• Associated symptoms such as fever, nausea, or vomiting

Physical Examination

A careful abdominal examination may identify:

• Localised tenderness

• Signs of inflammation

• Guarding

• Rebound tenderness

Blood Tests

Blood tests may show:

• Elevated white blood cell count

• Evidence of infection

• Signs of inflammation

Imaging Tests

Imaging studies are often used to confirm the diagnosis.

These may include:

• Ultrasound

• CT scan

• MRI scan in selected patients

What Are the Complications of Untreated Appendicitis?

Early treatment is important because appendicitis can progress rapidly.

Perforated (Burst) Appendix

A ruptured appendix allows infection to spread into the abdominal cavity.

Appendiceal Abscess

An abscess is a collection of infected fluid or pus around the appendix.

Peritonitis

This is a serious infection of the lining of the abdomen that may require urgent surgery and intensive medical treatment.

Complicated appendicitis is often associated with longer hospital stays and slower recovery.

When Should I Seek Urgent Medical Attention?

Seek medical attention immediately if you develop:

• Severe abdominal pain

• Pain moving to the lower right abdomen

• Fever together with abdominal pain

• Persistent nausea or vomiting

• Increasing abdominal tenderness

• Symptoms that continue to worsen

Prompt assessment may help prevent rupture and serious infection.

What Is the Best Treatment for Appendicitis?

Surgery (Appendicectomy) -- The Gold Standard Treatment

For most patients, surgery to remove the appendix is the definitive and recommended treatment.

Benefits include:

• Removal of the infected appendix

• Prevention of recurrence

• Reduced risk of rupture

• Definitive treatment of the condition

International surgical guidelines continue to recognise appendicectomy as the standard treatment for acute appendicitis.

Laparoscopic (Keyhole) Appendicectomy

Most patients today undergo minimally invasive laparoscopic surgery.

Advantages include:

• Smaller incisions

• Less postoperative pain

• Reduced scarring

• Faster recovery

• Shorter hospital stay

• Earlier return to work and daily activities

Can Appendicitis Be Treated Without Surgery?

In carefully selected patients with uncomplicated appendicitis, treatment with antibiotics alone may occasionally be considered.

However:

• Symptoms may recur

• Future episodes remain possible

• Surgery remains the definitive treatment

Treatment decisions should always be individualised after consultation with a surgeon.

Recovery After Appendix Surgery

Most patients recover quickly following laparoscopic appendicectomy.

Many patients are able to:

• Walk on the day of surgery or the next day

• Return home within one to two days

• Resume light activities within several days

• Return to work within one to two weeks depending on the nature of their job

Recovery may take longer in cases of perforated appendicitis or abscess formation.

Appendicitis Treatment in Singapore

Appendicitis is one of the most common emergency surgical conditions treated in Singapore.

Patients experiencing persistent abdominal pain, particularly pain affecting the lower right side of the abdomen, should seek prompt medical evaluation.

Early diagnosis and treatment can significantly reduce the risk of complications such as perforation, abscess formation, and prolonged hospitalisation.

At The Aeden Surgeons, Dr Jonathan Foo provides comprehensive assessment, diagnosis, and surgical treatment for appendicitis using evidence-based and minimally invasive techniques whenever appropriate.

Frequently Asked Questions About Appendicitis

What does appendicitis pain feel like?

Appendicitis pain typically starts around the belly button before moving to the lower right side of the abdomen. The pain usually becomes progressively worse over time.

Is appendicitis an emergency?

Yes. Appendicitis is considered a surgical emergency because delaying treatment increases the risk of rupture and serious infection.

Can appendicitis go away on its own?

Appendicitis generally does not resolve reliably without treatment. Medical assessment is strongly recommended.

How quickly can appendicitis become serious?

Appendicitis may worsen within hours to days. Early medical attention helps reduce the risk of complications.

Can I live normally without an appendix?

Yes. The appendix is not essential for normal digestion, and patients can live completely normal lives after appendicectomy.

How long does appendix surgery take?

Most laparoscopic appendicectomies take approximately 30 to 90 minutes, depending on the complexity of the case.