Abdominal rigidity is stiffness of your stomach muscles that worsens when you touch, or someone else touches, your abdomen. It’s an involuntary response to prevent pain caused by pressure on your ...

Cogwheeling is a type of rigidity seen in people with Parkinson’s disease. It’s often an early symptom of Parkinson’s, and it may be used to make a diagnosis. Cogwheeling, also known as cogwheel ...