Listening to Your Hands: What Brittle or Splitting Nails Say About Your Health
The Anatomy of a Nail: How Growth Occurs
To understand why your nails are splitting, it helps to understand how they are built. The visible part of your nail—the nail plate—is made of tightly packed, translucent layers of a hardened structural protein called keratin.
Nail Matrix (Under Cuticle) -> Rapid Cell Division -> Keratinization (Cells Flatten & Harden) -> Visible Nail Plate Pushed Outward
The actual production happens hidden beneath the cuticle at the nail matrix. This area continuously divides cells and pushes them forward. As new cells form, older cells are compressed, flattened, and injected with keratin in a process called keratinization.
Because your fingers are at the absolute edge of your circulatory system, any dip in your systemic nutrition, hydration, or thyroid hormone levels hits the nail matrix first. This disrupts the smooth layering of the keratin, causing the visible plate to become thin, brittle, and prone to peeling.
The 4 Root Causes Behind Splitting and Brittle Nails
When your nails are constantly breaking, the underlying cause typically falls into one of four distinct categories:
