Go see you family doctor.
Possibly a umbilical hernia, or an infection. Best bet is to see your doctor for medical advice.
Hi!
The origin of pain can either be in the abdominal muscles or inside the abdomen. The place which you describe can become painful in case of an abscess or an infected hematoma in abdominal muscles. It could also be a periumbilical hernia that has got trapped resulting in small bowel obstruction or mesenteric ischemia. Early appendicitis too behaves this way and so does colitis. It could also be cystitis, urinary tract infection, diverticulitis or inflammatory bowel disease.
It is difficult to comment beyond this at this stage. A clinical examination followed by a CT scan of the abdomen should be done. Do discuss this with your doctor and get yourself examined. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.