A muscle biopsy is a minor surgical procedure. Doctors order them to help diagnose certain diseases that involve muscles. During a muscle biopsy, a small piece of tissue is removed from a specific ...

Tight and rigid muscles are often the result of injury. Sometimes, muscle tightness and rigidity can occur with other symptoms, such as muscle pain and spasms, or reduced mobility. Mild muscle ...

Muscle pain that does not go away after several days or is accompanied by symptoms such as fever, shortness of breath, and extreme weakness requires medical assistance. Muscle pain, also called ...