What are Terry's Nails?
Terry's Nails is a physical sign in which the vast majority of the nail plate (often up to 80%) appears opaque and white, resembling ground glass, while leaving a very distinct, narrow band of normal pink or reddish-brown at the very tip (the distal edge). Furthermore, the lunula (the white half-moon at the base) is completely obscured.
Clinical Identification
Terry's nails are a classic example of apparent leukonychia—the whiteness is in the vascular bed, not the nail plate itself.
Key Features
- The nail looks like white ground-glass.
- A 1-2mm pink/red band remains at the free edge.
- Affects all fingernails and toenails simultaneously.
- The whiteness disappears temporarily when pressure is applied.
Mechanism
- Caused by an overgrowth of connective tissue and a decrease in blood supply in the nail bed.
- Not caused by fungus or local trauma.
Systemic Associations
Terry's nails are famously known as a "mirror" of severe systemic organ disease. If you observe this, it is rarely a localized issue.
- Liver Cirrhosis: The most famous association. Terry originally described this in patients with severe hepatic cirrhosis.
- Congestive Heart Failure (CHF): Decreased blood flow and systemic edema contribute to the blanching of the nail bed.
- Type 2 Diabetes: Highly prevalent in adult-onset diabetes, especially those with poor peripheral circulation.
- Aging: It can occasionally be a normal variant in very elderly patients without underlying disease.
Diagnostic Action
Because of its strong association with liver and heart failure, the sudden appearance of Terry's nails requires a comprehensive medical workup. A physician should order liver function tests (LFTs), an echocardiogram, and a hemoglobin A1C to rule out these severe systemic conditions.