Which burn depth is typically painless due to nerve destruction?

Which burn depth is typically painless due to nerve destruction?

• A. Third-degree burn
• B. First-degree burn
• C. Second-degree superficial partial-thickness burn
• D. Subdermal burn with intact sensation

Answer: (A)

When tissue destruction reaches the full thickness of the skin, the nerves in that area are destroyed as well. This leaves the burned region insensate, so it feels painless despite the obvious severity of injury. This is characteristic of a full-thickness (third-degree) burn, where all skin layers—and often underlying tissues—are damaged and nerve endings are destroyed. In contrast, superficial or partial-thickness burns involve surface nerves, so they are painful due to exposed nerve endings and inflammation. A burn depth described as subdermal with intact sensation would imply that nerve fibers are still present, which would not be painless. Therefore, the painless burn is the full-thickness type.

When tissue destruction reaches the full thickness of the skin, the nerves in that area are destroyed as well. This leaves the burned region insensate, so it feels painless despite the obvious severity of injury. This is characteristic of a full-thickness (third-degree) burn, where all skin layers—and often underlying tissues—are damaged and nerve endings are destroyed.

In contrast, superficial or partial-thickness burns involve surface nerves, so they are painful due to exposed nerve endings and inflammation. A burn depth described as subdermal with intact sensation would imply that nerve fibers are still present, which would not be painless. Therefore, the painless burn is the full-thickness type.