Sudden Abdominal Pain
Where: Around your navel; may be accompanied by nausea, fever, vomiting, loss of appetite, pressure to have a bowel movement or stiffening of the abdominal muscles.
Possible causes: Appendicitis
What to do: Go to the hospital. Appendicitis must be treated quickly or the appendix will rupture and leak infected fluid into other parts of the abdomen. Stiffening of abdominal muscles is a sign that infection is starting to spread.