Muscle strain and sprain are both injuries that affect the musculoskeletal system, but they involve different structures.
Muscle strain refers to the stretching or tearing of a muscle or tendon. It usually occurs due to overexertion, improper use of muscles, or sudden movements. Symptoms include pain, swelling, and limited range of motion.
Sprain, on the other hand, refers to the stretching or tearing of a ligament, which connects bones together. It typically occurs when a joint is forced beyond its normal range of motion. Symptoms include pain, swelling, bruising, and instability of the joint.
In summary, muscle strain affects muscles and tendons, while sprain affects ligaments. Both injuries can be painful and require appropriate treatment and rest for proper healing.