Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.
There may be no known cause for a muscle disorder. Some known causes include
- Injury or overuse, such as sprains or strains, cramps or tendinitis
- Genetics, such as muscular dystrophy
- Some cancers
- Inflammation, such as myositis
- Diseases of nerves that affect muscles
- Certain medicines