[2] Many people delay seeing their health practitioner about this issue because they assume the line is from a bruise. After all, everyone stubs their toe or hurts their finger from time to time.

A bruised toenail, or subungual hematoma, is when the nail becomes injured from trauma (such as dropping a heavier object on ...

The nail may also fall off before it regrows. A bruised nail may feel tender as it heals. Nail biting can cause pain, and it may damage tissue that helps nails to grow. Nail biting, which includes ...