Grade-1 muscle injury, also known as mild muscle strain, is the least severe type of muscle injury. It involves overstretching or tearing of a small number of muscle fibers, resulting in mild pain, swelling, and limited mobility. The affected muscle may feel tender to the touch, but there is usually no bruising or discoloration. Grade one muscle injuries typically heal on their own within a few days to a couple of weeks with rest, ice, compression, and elevation (RICE) therapy. Gentle stretching and strengthening exercises may also be recommended to help improve the range of motion and prevent future injury. In most cases, athletes and individuals with grade-1 muscle injuries can return to their regular activities once the pain and swelling have subsided.

Grade-2 muscle injury, also known as a moderate muscle strain, is a more severe type of muscle injury than grade-1. It involves a greater number of muscle fibers being torn or ruptured, causing more significant pain, swelling, and limited mobility. The affected muscle may feel tender to the touch, and there may be visible bruising or discoloration. Grade 2 muscle injuries typically require a longer recovery time, ranging from a few weeks to several months, depending on the extent of the damage. Treatment options may include rest, ice, compression, and elevation (RICE) therapy, as well as physical therapy, pain management, and sometimes surgery. It is important to seek medical attention for a grade 2 muscle injury to prevent further damage and ensure proper healing. Athletes and individuals with grade-2 muscle injuries may need to take a break from their regular activities until they have fully recovered.

Grade-3 muscle injury, also known as severe muscle strain, is the most severe type of muscle injury. It involves a complete tear or rupture of the muscle fibers, resulting in significant pain, swelling, and loss of function. The affected muscle may feel very tender to the touch, and there may be extensive bruising or discoloration. Grade-3 muscle injuries require a long recovery period, often several months, and may even require surgery. Treatment options may include rest, ice, compression, and elevation (RICE) therapy, physical therapy, pain management, and surgery in some cases. It is essential to seek medical attention immediately for a grade-3 muscle injury to prevent further damage and ensure proper healing. Athletes and individuals with grade-3 muscle injuries will need to take a break from their regular activities and may require an extended period of rehabilitation before returning to full function.