Disorder     Signs & Symptoms   Cause

Cramp
Sudden muscle pain, mostly commonly in the calf muscle
The muscle suddenly shortens, which can be due to exercise, nerves or tendons shortening due to age

Sprains
Pain, inflammation, lack of movement
A stretch, tear or twist of a ligament due to force

Strains
Pain, inflammation, lack of movement
A stretch, tear or twist of a muscle fibre due to force

Fibromyalgia
Pain and stiffness in the muscles, ligaments and tendons
No known cause

Muscular Dystrophy
Causes muscles weakness which slowly gets worse and loss of muscle tissue inherited

Spasticity
An abnormal increase in muscle tone or stiffness in the muscles which will affect movement
May occur with spinal cord injury, MS, Cerebral palsy, brain damage