Medically reviewed by Prof. Dr. Zahid Mahmood, MBBS, FCPS — General, Laparoscopic & Laser Surgeon, Lahore.
Acute appendicitis is inflammation of the appendix and one of the commonest causes of urgent abdominal surgery. It often begins with vague pain near the navel before moving to the lower-right abdomen. Loss of appetite, nausea, vomiting and fever may follow.
Symptoms are not always typical, especially in young children, older adults and pregnant patients. Because untreated inflammation can progress to gangrene, perforation, abscess or widespread infection, worsening abdominal pain needs timely medical assessment.
What is the appendix?
The appendix is a narrow, finger-shaped tube attached to the first part of the large bowel, usually in the lower-right abdomen. It contains lymphoid tissue and may have a role in gut immunity, but removing it does not cause a recognised long-term loss of immune or digestive function.
What causes acute appendicitis?
Appendicitis is associated with bacterial multiplication and inflammation within the appendix. In many cases, its narrow channel becomes blocked by hardened stool called an appendicolith, swelling of lymphoid tissue or a stricture. Rare causes include parasites or a tumour near the opening of the appendix, particularly in older adults.
Blockage can raise pressure inside the appendix, impair blood flow and allow infection to spread through its wall. The appendix may become gangrenous or perforate, releasing infected material into the abdomen. Sometimes surrounding tissues contain the infection, producing an inflammatory mass or abscess.
Appendicitis is not usually caused by one particular meal, and there is no dependable home method for preventing it.
Typical symptoms of appendicitis
- Pain beginning near the navel or in the middle of the abdomen
- Pain moving to the lower-right abdomen and becoming more constant
- Loss of appetite
- Nausea, sometimes followed by vomiting
- Low-grade fever
- Pain worsened by walking, coughing, sudden movement or bumps during travel
- Local tenderness or guarding in the lower-right abdomen
The classic movement of pain occurs in only about half of proven cases. Some patients have poorly localised or atypical pain, so the absence of a textbook pattern does not rule out appendicitis.
Why symptoms may be different
The appendix can lie behind the caecum, deep in the pelvis or in another position. A retrocaecal appendix may cause flank or back discomfort with less obvious abdominal guarding. A pelvic appendix may cause lower abdominal pressure, urinary symptoms, diarrhoea or discomfort on rectal examination.
Young children may be unable to describe their symptoms and can deteriorate quickly. Older patients may have milder pain or fever despite advanced inflammation. During pregnancy, nausea and abdominal discomfort may be attributed to pregnancy itself; lower-right pain nevertheless remains an important warning symptom.
When should you seek urgent care?
Seek same-day medical assessment for abdominal pain that is persistent, progressively worsening or associated with loss of appetite, nausea, vomiting or fever. Go urgently to a hospital if there is:
- Severe or spreading abdominal pain
- A rigid, very tender or swollen abdomen
- Repeated vomiting or inability to drink
- High fever, chills, confusion, faintness or a rapid heartbeat
- Temporary improvement followed by severe widespread pain
- Worsening pain during pregnancy
Do not try to diagnose appendicitis by pressing repeatedly on the abdomen. Avoid laxatives or enemas when appendicitis is suspected, and do not let painkillers delay medical assessment.
How is appendicitis diagnosed?
A surgeon or emergency doctor takes a careful history and examines the abdomen for local tenderness, guarding and signs of peritoneal irritation. Other conditions can resemble appendicitis, including gastroenteritis, urinary stones or infection, Crohn’s disease, diverticulitis, ovarian cysts, ovarian torsion and ectopic pregnancy.
Tests may include:
- Blood tests: white-cell count and C-reactive protein can support the diagnosis and assess inflammation, but no single blood test proves or excludes appendicitis.
- Urinalysis: helps identify urinary infection or stones, although mild urine abnormalities can also occur with appendicitis.
- Pregnancy testing: important for patients who could be pregnant because it changes the differential diagnosis and imaging plan.
- Clinical scores: tools such as the Alvarado score combine symptoms, examination findings and blood results to estimate risk; they support rather than replace clinical judgement.
- Ultrasound: avoids radiation and is a reasonable first scan, particularly for children, young adults and pregnancy.
- CT scan: is highly accurate and helps distinguish uncomplicated appendicitis from perforation, abscess or another diagnosis. Low-dose protocols may reduce radiation exposure in younger adults.
- MRI: provides detailed imaging without ionising radiation and is useful in selected patients, including pregnancy, where available.
Uncomplicated and complicated appendicitis
Uncomplicated appendicitis means the appendix is inflamed without a visible perforation, abscess or widespread peritonitis. Complicated appendicitis includes gangrene, perforation, an abscess, an inflammatory mass or infection spreading through the abdomen.
This distinction affects treatment, antibiotic duration, hospital stay and recovery.
Treatment with surgery
Appendicectomy—surgical removal of the appendix—remains the definitive treatment and is generally recommended for most suitable patients. Before surgery, patients receive intravenous fluids, pain relief and antibiotics. The exact urgency depends on clinical stability and the likelihood of perforation; resuscitation and safe preparation should not be skipped.
Laparoscopic appendicectomy
Keyhole surgery is performed under general anaesthesia through a few small incisions. A camera allows the surgeon to inspect the abdomen, divide the appendix safely and remove it in a specimen bag. Compared with open surgery, laparoscopy commonly offers smaller wounds, fewer wound infections and quicker recovery. It is also helpful when the diagnosis is uncertain.
Open appendicectomy
Open surgery through a small lower-right abdominal incision remains safe and effective. It may be selected according to the patient’s condition, previous surgery, the extent of infection, available equipment or the surgeon’s judgement. Occasionally a keyhole operation needs conversion to an open procedure for safety.
Can antibiotics treat appendicitis without surgery?
Antibiotics alone can successfully settle some carefully selected cases of CT-confirmed uncomplicated appendicitis, particularly when there is no appendicolith. This can avoid an immediate operation, but treatment may fail during the first admission and appendicitis can recur later.
Current surgical guidance generally favours appendicectomy because it provides a definitive cure. Non-operative treatment may be reasonable after shared decision-making for a stable patient who understands the chance of recurrence and has reliable access to follow-up and urgent surgery if symptoms return. It is not appropriate for diffuse peritonitis, clinical deterioration or many cases involving gangrene, perforation or obstruction by an appendicolith.
What if there is an appendix mass or abscess?
A well-contained inflammatory mass or abscess may sometimes be managed initially with intravenous antibiotics, close observation and image-guided drainage of pus. Immediate surgery through severely inflamed tissue can be difficult in selected cases. Worsening pain, a rising pulse, spreading tenderness or sepsis may require urgent operation.
After recovery, follow-up is important. The need for interval appendicectomy is individualised, but it deserves particular consideration after complicated appendicitis and in patients over 40 because an underlying appendiceal or caecal growth is more likely in this group. Follow-up imaging or colonoscopy may be advised.
Appendicitis during pregnancy
Appendicitis is the commonest non-obstetric surgical abdominal emergency in pregnancy. Delayed diagnosis and perforation increase risks to both mother and baby. Ultrasound is often used first, followed by MRI when necessary and available. Laparoscopic appendicectomy can be performed during pregnancy by an experienced team with appropriate obstetric support.
Recovery after appendicectomy
After uncomplicated keyhole surgery, many patients begin drinking, eating and walking within hours and leave hospital the same day or the following day, depending on local practice and their condition. Pain and tiredness gradually improve over several days.
Return to work and exercise depends on the operation, the severity of infection and the nature of the job. Patients recovering from perforated appendicitis or an abscess usually need a longer hospital stay and may require a short postoperative course of antibiotics.
The removed appendix is examined by a pathologist. This confirms inflammation and can occasionally reveal an unexpected tumour or another condition needing follow-up.
Warning signs after surgery
Contact the surgical team urgently for:
- Increasing rather than improving abdominal pain
- Persistent fever, chills or feeling increasingly unwell
- Repeated vomiting or inability to eat and drink
- Increasing wound redness, swelling, pus or separation
- Progressive abdominal swelling or inability to pass stool or gas
- Breathing difficulty, chest pain or swelling of a leg
Fever and malaise several days after surgery can indicate a wound infection or an intra-abdominal collection and need prompt assessment.
Common questions
Can appendicitis go away by itself?
Some early uncomplicated cases may improve with antibiotics and occasional episodes may settle, but there is no safe way to predict this at home. Suspected appendicitis requires medical assessment because deterioration or perforation can occur.
Can a blood test confirm appendicitis?
No. Blood tests support the diagnosis but can be normal early in the illness. The final assessment combines history, examination, laboratory results and imaging when needed.
Can I live normally without an appendix?
Yes. Appendicectomy does not require a special lifelong diet or medication, and most patients return to normal health after recovery.
Is every patient operated on immediately?
No. Treatment is urgent but individualised. A short, medically supervised delay for fluids, antibiotics, imaging or safe daytime surgery may be reasonable in stable uncomplicated cases. Suspected perforation, sepsis or deterioration requires faster source control.
Key message
Acute appendicitis commonly causes worsening abdominal pain, loss of appetite, nausea and lower-right tenderness, but the presentation can be atypical. Early assessment allows accurate imaging and straightforward treatment. Waiting at home with progressive pain increases the risk of perforation, abscess and a more difficult recovery.
Consult an appendix surgeon in Lahore
Prof. Dr. Zahid Mahmood assesses acute abdominal pain and provides emergency and laparoscopic treatment for appendicitis in Lahore.
For urgent advice or an appointment, call 0300 413 0159 or visit professorzahid.com.
This article is for general education and does not replace urgent medical assessment. If you currently have severe or worsening abdominal pain, fever, repeated vomiting, faintness or a rigid abdomen, please seek emergency care now.
Medical references
- Williams NS, O’Connell PR, McCaskie AW, editors. Bailey & Love’s Short Practice of Surgery. 28th ed. CRC Press; 2023. Chapter 76, “The vermiform appendix,” pp. 1337–1348.
- Kumar SS, et al. SAGES Guideline for the Diagnosis and Treatment of Appendicitis. Society of American Gastrointestinal and Endoscopic Surgeons; 2023/2024.
- Di Saverio S, et al. Diagnosis and treatment of acute appendicitis: 2020 update of the WSES Jerusalem guidelines. World Journal of Emergency Surgery. 2020;15:27.