What sign is commonly associated with appendicitis?

Localized tenderness in the lower right quadrant is a classic sign associated with appendicitis. This occurs because the appendix is situated in the right lower quadrant of the abdomen. When the appendix becomes inflamed, it often produces pain that is sharp and localized in that area. This tenderness is usually aggravated by movement and can be accompanied by guarding, which is the body's reflex to protect the area from further discomfort.

The other options involve signs that are less characteristic of appendicitis. Rebound tenderness in the upper abdomen is not typical for appendicitis, as the pain is more specific to the lower right quadrant. Widespread abdominal pain with bloating may suggest a different gastrointestinal issue or a more diffuse abdominal process rather than localized appendicitis. Constant pain in the lower back is also not a symptom directly linked to appendicitis, as it primarily involves pain in the lower right abdomen. Therefore, recognizing localized tenderness as a key sign allows for more precise identification and prompt medical evaluation for appendicitis.