Abdominal rigidity, also called guarding, is an involuntary stiffness of your stomach muscles that occurs when you touch your abdomen.

Nuchal rigidity refers to neck stiffness caused by bacterial meningitis and other serious medical conditions. Learn more about what causes it, what to expect, and more.

Muscle rigidity is characterized by the inability of the muscles to relax normally. Learn about muscle rigidity causes, diagnosis, and treatment.

Rigidity is a leading symptom of Parkinson’s disease. Learn about the symptoms, treatment, and more.

Parkinson's rigidity is often most noticeable when a person moves a joint through a circular movement with the movement feeling as if the joint is moving through a number of cogs, known as ...

Cognitive Rigidity, difficulty changing mental sets, is a core feature of Autism Spectrum Disorder and is commonly associated with a suite of challenging traits.

We show that the alignment of stress fibres in stem cells depends non-monotonically on the matrix rigidity, attaining a maximum value when the cell and matrix rigidity are similar.