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Repeating a movement over and over can injure muscles; nerves; tissues that connect bones to bone, also known as ligaments; and cords that connect muscles to bone, also known as tendons. These types of injuries are usually caused by doing too much or using poor form. They're more common with age.

Symptoms can include pain, tenderness, swelling or stiffness in the affected area.

Rest, pain medicines, physical therapy and possibly surgery can help heal a repetitive strain injury. Improving form might help prevent re-injury.