Involuntary abdominal rigidity should always be evaluated by your health care provider.

Abdominal rigidity is stiffness of the muscles in the belly area, which can be felt when touched or pressed.

Similarly, if the appendix lies entirely within the pelvis, there is usually complete absence of abdominal rigidity.

Abdominal rigidity may occur along with:

Abdominal Rigidity Learn about the causes of Abdominal Rigidity and treatments for Abdominal Rigidity in the Symptoms Dictionary at HowStuffWorks.