---
title: "Mood Swings in Your 40s: Causes, What Helps, and Lab Tests"
description: "Mood swings in your 40s often come from perimenopause hormone shifts, thyroid imbalance, or poor sleep and stress overload. Targeted labs—no referral."
canonical: "https://www.vitalsvault.com/symptoms/mood-swings-in-40s"
last-updated: 2026-08-22
---

# Mood Swings in Your 40s: Causes, What Helps, and Lab Tests

> Mood swings in your 40s often come from perimenopause hormone shifts, thyroid imbalance, or poor sleep and stress overload. Targeted labs—no referral.

---

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