An 18-year-old boy presented with abdominal pain, vomiting, and painful urination, leading to a diagnosis of appendicitis confirmed by elevated WBC, CRP, and ultrasound indicating inflammation. Key physical signs included McBurney's point tenderness and a positive Rovsing's sign. Immediate surgery, likely through laparoscopic method, is recommended to remove the inflamed appendix to prevent complications such as peritonitis.