This is most commonly infectious in origin but can occur due to other causes as well.
Pain in appendicitis
is usually sharp and starts in
the periumbilical area (area around the umbilicus) and later shifts to the right back
ground-color: #dae8f4'>lower zone. It is usually associated with vomiting and some fever. A dull aching pain with severe tenderness in the right back
ground-color: #dae8f4'>lower zone may persist for few days. Hence, given your description, the likelihood of appendicitis is low.