---
title: "Brittle Nails at Night: Causes, Fixes, and Lab Tests"
description: "Brittle nails at night often come from dehydration after washing, low iron or thyroid slowdown, and targeted labs can pinpoint it—no referral needed."
canonical: "https://www.vitalsvault.com/symptoms/brittle-nails-at-night"
last-updated: 2026-08-22
---

# Brittle Nails at Night: Causes, Fixes, and Lab Tests

> Brittle nails at night often come from dehydration after washing, low iron or thyroid slowdown, and targeted labs can pinpoint it—no referral needed.

---

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