A boxer's fracture is when the bone in your hand that connects to your pinky finger (called the fifth metacarpal) gets broken. This can happen if you hit something really hard with your hand, like a wall or another person's head, without wearing gloves or without using proper technique.
When your hand gets hit, the bones can't handle the force and end up cracking or breaking. This can cause a lot of pain, swelling, and bruising in your hand.
To fix a boxer's fracture, a doctor may have to put your hand in a cast or brace to help the bone heal and prevent further damage. Sometimes, surgery is needed to properly align the bone and hold it in place.
It's important to take care of your hands and avoid hitting things too hard without proper protection or training to prevent a boxer's fracture from happening in the first place.