Final answer:
The diagnosis for the woman's abdominal pain is appendicitis.
Step-by-step explanation:
The diagnosis for the 24-year-old woman presenting with abdominal pain that has migrated to the right lower quadrant (RLQ) is appendicitis.
Appendicitis is characterized by pain that starts around the umbilical area and then migrates to the RLQ. The pain is typically described as a stabbing pain that worsens with movement, which aligns with the symptoms described by the patient.
In addition to the abdominal pain and its migration, the physical examination findings of tenderness and guarding in the RLQ further support the diagnosis of appendicitis.