What is a common sign of appendicitis when the hip is flexed and internally rotated?

When the hip is flexed and internally rotated, a common sign of appendicitis is indeed pain in the abdomen. This maneuver can elicit a specific pain response known as the psoas sign, which occurs due to the irritation of the iliopsoas muscle as it lies adjacent to the inflamed appendix. In patients with appendicitis, movement of the hip in this manner can aggravate their condition, leading to increased abdominal pain, particularly in the right lower quadrant.

While increased heart rate, swelling in the foot, and difficulty breathing can be associated with various medical conditions, they are not specific signs indicative of appendicitis. In contrast, the abdominal pain associated with hip flexion and internal rotation directly points to issues like appendicitis, demonstrating the body's reaction to an inflamed appendix in that particular position.