A 20-year-old male presents with acute onset of abdominal pain, nausea, and vomiting

A 20-year-old male presents with acute onset of abdominal pain, nausea, and vomiting

A 20-year-old male presents with acute onset of abdominal pain, nausea, and vomiting. Physical examination shows rebound tenderness and guarding in the right lower quadrant. What is the most likely diagnosis?

A. Acute appendicitis

B. Acute cholecystitis

C. Acute pancreatitis

D. Gastrointestinal perforation

E. Renal colic

Answer: A

Explanation: Acute appendicitis is characterized by acute abdominal pain (initially periumbilical, then migrating to the right lower quadrant), nausea, vomiting, and signs of peritoneal inflammation (rebound tenderness, guarding). It is most common in young adults.