Roughly 233 out of every 100,000 people develop appendicitis each year worldwide. For the United States, that translates to more than 300,000 cases annually, making it one of the most common reasons for emergency abdominal surgery. Your lifetime risk sits somewhere around 7 to 8 percent, meaning about 1 in 13 people will deal with appendicitis at some point.
Who Gets Appendicitis Most Often
Appendicitis hits hardest between the ages of 10 and 30. Within that window, teenagers and young adults aged 16 to 20 face the highest risk, with incidence rates roughly 8.5 times greater than in children under 5. The rate drops steadily from there but never disappears entirely. People in their 60s and 70s still develop appendicitis at rates about 3 to 4 times higher than very young children, and cases in older adults tend to be more dangerous because symptoms are often subtler and diagnosis gets delayed.
Among children specifically, appendicitis is the leading cause of urgent abdominal surgery. About 53,000 children undergo appendectomy each year in the U.S. alone.
Rates Vary Widely by Region
Where you live plays a surprisingly large role. High-income countries in the Asia Pacific region have the highest rates in the world, at roughly 364 cases per 100,000 people per year. Western sub-Saharan Africa has the lowest, at about 81 per 100,000. These differences likely reflect a mix of diet, access to diagnostic imaging, and how cases are classified, since better diagnostic tools can make incidence appear higher simply by catching cases that would have gone unrecorded elsewhere.
Globally, the overall age-standardized incidence rate has been declining since 1990. But that trend masks what’s happening in specific regions: nearly half of all global regions have seen their rates climb by more than 10 percent over the same period. In many developing countries, appendicitis is becoming more common as diets shift and urbanization increases, while improved access to CT scans and ultrasound means more cases are formally diagnosed.
Race, Income, and Outcomes
Appendicitis itself doesn’t strongly favor one racial or ethnic group over another, but complications do. In studies of patients who all had equal access to healthcare, perforation rates and hospital stays were similar regardless of race or income. The problem arises when access isn’t equal. Minority and lower-income patients in systems with barriers to care historically experience higher rates of ruptured appendixes, not because they’re biologically more susceptible, but because they tend to reach a surgeon later.
How Often the Appendix Ruptures
About 30 percent of people hospitalized for appendicitis have a perforated (ruptured) appendix by the time they’re treated. Perforation is more common at the extremes of age. Young children can’t always articulate their symptoms clearly, and older adults often present with vague pain that doesn’t follow the classic pattern, so both groups are more likely to be diagnosed late. Once the appendix ruptures, the risk of infection, abscess, and a longer recovery increases significantly.
Surgery vs. Antibiotics
Appendectomy remains the standard treatment, and modern outcomes are excellent. The 30-day mortality rate for uncomplicated appendicitis surgery in adults is 0.04 percent, and the rate of serious complications is about 2 percent. Most patients go home the same day or the next.
Antibiotics alone are now a proven alternative for uncomplicated cases, meaning the appendix hasn’t ruptured and there’s no abscess. Studies show a 58 to 75 percent success rate at one year, meaning roughly one in four patients treated with antibiotics will eventually need surgery anyway. Importantly, that delay doesn’t increase the risk of complications when surgery does happen. This option is particularly relevant for people who want to avoid surgery or who have conditions that make anesthesia risky.
Warmer Weather and Timing
Appendicitis cases tick upward during warmer months. A large study published in JAMA Network Open found that higher ambient temperatures are independently associated with increased appendicitis incidence, even after accounting for seasonal patterns. The mechanism isn’t fully understood, but changes in gut bacteria, dehydration, and dietary shifts during summer months are all plausible contributors. The effect is modest, so it’s not something worth worrying about on an individual level, but it’s a consistent finding across populations.