Sudden (acute) illnesses, such as
strep throat and
influenza (flu), can cause belly pain when the
glands in the belly become swollen or inflamed. These glands are called lymph nodes. When they are inflamed, it's called mesenteric adenitis.
ByHealthwise Staff Primary Medical ReviewerWilliam H. Blahd, Jr., MD, FACEP - Emergency Medicine Adam Husney, MD - Family Medicine