What are the different grades of sprains and what are they?

Sprains are classified into three grades based on their severity. A Grade I sprain involves mild stretching and microscopic tearing of ligaments, resulting in some pain and swelling but little to no joint instability. A Grade II sprain is more severe, marked by partial tearing of ligaments, leading to moderate pain, swelling, and some instability in the joint. A Grade III sprain entails a complete tear of the ligament, causing severe pain, significant swelling, and joint instability, often requiring medical intervention.