Stiffness

Stiffness (especially muscle stiffness) is a condition that makes a part of the body (usually a joint) hard to move. It becomes difficult for the bone in that joint to move freely. As a result, the person cannot move as easily as before. [1]

History

The word "stiff" comes from Old English and Germanic languages. It means rigid, inflexible, or hard to bend.[2]

Causes

Stiffness is caused by diseases such as Swine influenza. But is also causes by sitting for too long, exercise, Aging, Dehydration, and others.[3]

References

  1. ↑ Ley, Cameron D.; Valdes, Eduardo Martinez; Murtagh, Conall F.; Power, Jonathan; Drust, Barry (2025-10-01). "Shear wave elastography provides reliable assessments of stiffness in the skin, fascia, and both superficial and deep muscle tissues". Journal of Electromyography and Kinesiology. 84: 103050. doi:10.1016/j.jelekin.2025.103050. ISSN 1050-6411.{{cite journal}}: CS1 maint: article number as page number (link)
  2. ↑ "Stiff - Etymology, Origin & Meaning". etymonline. Retrieved 2026-05-06.
  3. ↑ Seidenburg, Misty (2024-03-25). "Causes of Muscle Stiffness & Treatments | BenchMark PT". BenchMark Physical Therapy. Retrieved 2026-05-06.
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