What are the early warning symptoms of appendicitis?

The early symptoms of appendicitis mainly include: 1. **Abdominal pain**: This is the earliest and most common symptom. The pain typically begins in the upper abdomen or around the navel, and may be either persistent or intermittent. It subsequently shifts and localizes in the right lower quadrant, forming a characteristic migratory right lower quadrant pain. 2. **Gastrointestinal reactions**: Some patients may experience loss of appetite, nausea, vomiting, or even diarrhea. These symptoms result from irritation of the gastrointestinal tract caused by appendiceal inflammation. 3. **Systemic symptoms**: As the condition progresses, patients may develop systemic symptoms such as fever, fatigue, difficulty concentrating, and increased heart rate. These manifestations reflect the body's systemic response to inflammation.