Sudden, involuntary contraction of muscle or muscle group.
<physiology> Painful involuntary muscle contractions. Often seen in skeletal muscle after acute injury (muscle strain). ... (07 Apr 1998) ... 
Type: Term Synonyms: spasm
Muscle spasm is an involuntary contraction of a muscle that can cause a great deal of pain. When the facet joints of the spine become injured or inflamed, the muscles supporting the spine can spasm causing low back pain and limitation in motion. Muscle spasm is typically treated conservatively with muscle relaxants and exercise therapy. Muscle rela...
Sudden, involuntary contraction of muscle or muscle group.
Sudden, involuntary contraction of muscle or muscle group.