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 ...

Muscle rigidity refers to stiffness or tension in your muscles. This tends to happen when muscles contract for a long period of time, often due to stress. But certain medications and underlying ...

Parkinson’s disease is a disorder of the central nervous system that gets worse over time with no cure. Because it targets the nervous system, it impairs movement. ‌Rigidity is one of the leading ...