Which of the following is a symptom of a first degree strain?

A first degree strain is characterized by mild damage to the musculature, typically involving only a few muscle fibers. The symptoms are generally less severe when compared to higher degree strains. Minor loss of function is common with a first degree strain, as the muscle may feel slightly weakened or tender, but the individual is usually still able to use the muscle without significant pain or loss of mobility. This level of strain does not involve extensive swelling or bruising, which are more typical of greater severity strains.

In contrast, extreme pain, severe swelling, and complete tear of muscle fibers are indicative of second or third degree strains, which represent more severe injuries involving greater damage to the muscle and potentially affecting its functionality more dramatically.