Acute Appendicitis
What is Acute Appendicitis?
Acute appendicitis happens when your appendix becomes inflamed and infected. The appendix is a small, tube-shaped pouch attached to your large intestine. When it gets blocked by stool, mucus, or other material, bacteria multiply inside and cause swelling.
This condition requires urgent medical attention. The inflamed appendix can rupture if left untreated, spreading infection throughout your abdomen. Appendicitis is one of the most common surgical emergencies, affecting about 1 in 20 people during their lifetime. It can happen at any age but occurs most often between ages 10 and 30.
Early detection matters because prompt treatment prevents serious complications. Most cases resolve with surgery to remove the appendix. Blood tests help doctors confirm the diagnosis and rule out other causes of abdominal pain.
Symptoms
- Sharp pain that starts near the belly button and moves to the lower right abdomen
- Pain that worsens with movement, coughing, or pressing on the area
- Nausea and vomiting
- Loss of appetite
- Low-grade fever that may increase as the condition worsens
- Abdominal swelling or bloating
- Inability to pass gas
- Constipation or diarrhea
- Tenderness when pressure is released from the lower right abdomen
Some people experience mild symptoms at first that gradually worsen over 12 to 24 hours. The location and intensity of pain can vary depending on age and the position of your appendix. Children and pregnant women may experience pain in different areas of the abdomen.
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Causes and risk factors
Appendicitis occurs when the opening of the appendix becomes blocked. This blockage can result from hardened stool, swollen lymph nodes in the intestine, intestinal worms, or traumatic injury. Once blocked, bacteria that normally live in your appendix begin to multiply rapidly. The trapped bacteria cause inflammation, swelling, and pus formation inside the appendix.
Anyone can develop appendicitis, but certain factors may increase your risk. Men have a slightly higher risk than women. People between ages 10 and 30 face the highest risk. A family history of appendicitis may increase your chances. Digestive infections and inflammatory bowel conditions can also raise your risk of blockage and inflammation.
How it's diagnosed
Doctors diagnose appendicitis through physical examination, medical history, and laboratory tests. During the exam, your doctor will press on your abdomen to check for tenderness and muscle guarding. Blood tests reveal elevated white blood cells, particularly neutrophils, which indicate infection and inflammation in your body. Rite Aid offers testing that includes neutrophil levels at Quest Diagnostics locations nationwide.
Imaging tests like ultrasound or CT scans help visualize the appendix and confirm inflammation. These scans can also detect complications like rupture or abscess formation. Urinalysis may be ordered to rule out urinary tract infections or kidney stones, which can cause similar symptoms. Quick diagnosis is critical because the risk of rupture increases significantly after 24 hours of symptoms.
Treatment options
- Emergency surgery to remove the appendix, called an appendectomy
- Laparoscopic surgery using small incisions and a camera for faster recovery
- Open surgery through a larger incision if the appendix has ruptured
- Antibiotics given intravenously before and after surgery to fight infection
- Pain medications to manage discomfort during recovery
- Clear liquid diet initially, advancing to solid foods as tolerated
- Rest and limited physical activity for 2 to 4 weeks after surgery
- Drainage of abscesses if infection has spread beyond the appendix
- In some cases, antibiotics alone may treat early appendicitis without surgery
Concerned about Acute Appendicitis? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Appendicitis typically develops over 12 to 24 hours. The pain often starts mild and vague around the belly button. It then becomes sharper and moves to the lower right abdomen as inflammation worsens. Symptoms can progress rapidly, so seek medical attention if you suspect appendicitis.
In rare cases, mild appendicitis may resolve with antibiotics alone. Most cases require surgery to prevent rupture and serious complications. Studies show that antibiotics work in about 70% of mild cases, but 30% of those patients develop appendicitis again within one year. Surgery remains the standard treatment because it eliminates the risk of future episodes.
A ruptured appendix spreads infection throughout your abdominal cavity, causing peritonitis. This serious condition requires immediate surgery and strong antibiotics. You may need to stay in the hospital for several days. Recovery takes longer after a rupture, and complications like abscesses or bowel blockages become more likely.
Elevated neutrophils in your blood indicate active infection and inflammation. Doctors look for both high total white blood cell counts and a high percentage of neutrophils specifically. A left shift, meaning more immature neutrophils, further supports the diagnosis. These blood test findings help doctors distinguish appendicitis from other causes of abdominal pain.
There is no proven way to prevent appendicitis because blockages occur unpredictably. A diet high in fiber may reduce the risk of constipation and hard stool that could block the appendix. Treating intestinal infections promptly may also help. Staying aware of symptoms allows for early treatment before complications develop.
Recovery from laparoscopic appendectomy usually takes 1 to 3 weeks. Open surgery or treatment of a ruptured appendix may require 4 to 6 weeks of healing. Most people return to light activities within a few days. Avoid heavy lifting and strenuous exercise until your doctor clears you, typically after 2 to 4 weeks.
Yes, appendicitis affects people of all ages including children and pregnant women. In children, symptoms may be less specific and harder to identify. Pregnant women may feel pain higher in the abdomen as the growing uterus shifts the appendix position. Diagnosis can be more challenging in both groups, requiring careful clinical evaluation and imaging.
Several conditions cause similar right lower abdominal pain. These include kidney stones, urinary tract infections, ovarian cysts, ectopic pregnancy, and inflammatory bowel disease. Gastroenteritis, or stomach flu, can also cause pain and nausea. Blood tests, imaging, and physical examination help doctors distinguish appendicitis from these other conditions.
Most people have no long-term effects after appendectomy. Your appendix is not essential for normal body function. Some studies suggest the appendix may play a small role in gut immunity, but removal does not cause noticeable immune problems. You can live a normal, healthy life without your appendix.
Seek emergency care if you have severe abdominal pain that worsens over hours. Go immediately if pain moves to your lower right abdomen with fever, vomiting, or inability to pass gas. Sudden relief of pain may signal rupture and requires urgent attention. Do not take pain medication before seeing a doctor, as it may mask important symptoms.