A muscle injury is a tear or bruise of the muscle itself. Muscle soreness is more commonly the burning from lactic acid trapped in the muscles that is burned off with strenuous use of the muscle.
Muscle soreness
Make sure to stretch before and after exercise, it reduces the lactic acid in the muscles reducing soreness. If it's soreness from the rebuilding of muscle then it's fine but if it's soreness due to injury then don't exercise without consent of a doctor.
Injury caused by a blunt object does not usually cause immediate soreness or pain.
Depends on the severity of the injury. Can be anything from soreness that passes by itself, to conditions that requires surgery, maybe even amputation to sort out.
* improves physical performance * decreaces risk of injury * redouces muscle soreness * improves posture * Increased Blood and Nutrients to Tissues
You can pop a muscle
Muscle overuse results in soreness and stiffnessof the muscles.
The leading hypothesis for delayed onset muscle soreness are the: connective tissue damage hypothesis the skeletal muscle damage hypothesis the spasm hypothesis
microtrauma
Post Exercise Muscle Soreness
Exercise and working out
Well, it could be the fact you're not used to using it or using it in the way you recently did. Happens a lot from that. The scientific answer to what produces muscle soreness is lactic acid.