Hello, I have been having on and off dull sensation in the right side of tny stomach. It's usually above the naval but sometimes it moves to the lower region as well. It's kind of like a constant dull sensation but not pain. When I press the area, I do not feel any pain or tenderness. What could it be? I have had an ultrasound abdomen last yr which showed everything was normal. I do not have any other symptoms such as fever etc