A muscle tear or muscle strain happens when your muscle is overstretched. Muscle strains can happen in varying degrees– (1 through 3) from a few muscle fibers being torn to nearly all of your muscle fibers tearing.
Disclaimer: The information above should not be used as a substitute for professional medical advice, diagnosis or treatment. You should seek the advice and care from a primary care physician or physical therapist. If you are experiencing a medical emergency, call 9-1-1.