---
title: "Can blood tests explain mood swings and irritability?"
type: symptom
url: "https://www.test-well.com/symptoms/mood-swings"
symptom: Mood swings and irritability
aliases:
  - mood changes blood test
  - irritability hormones
  - mood swings hormone test
reviewed_at: 2026-09-06
review_status: reviewed
date_published: 2026-09-05
lab_fee_usd: 6
---

# Can blood tests explain mood swings and irritability?

> Sometimes. Thyroid dysfunction, sex-hormone shifts (perimenopause, low testosterone), disrupted cortisol and low vitamin D all affect mood and are measurable. TSH, estradiol or testosterone, morning cortisol and vitamin D are the standard checks. Normal results are useful too — they turn attention to sleep, stress and mental-health support.


## When should you see a clinician instead of ordering a test?

- Thoughts of harming yourself or others — call or text 988 or emergency services now
- Mood changes with confusion, severe headache or a recent head injury — seek care

## Why these tests for mood swings and irritability?

Both hypo- and hyperthyroidism change mood; estrogen fluctuation in perimenopause is a classic cause of irritability and low mood; low testosterone in men is linked to irritability and low motivation; and vitamin D deficiency is associated with depressive symptoms. Cortisol screens for the rare adrenal causes.

## Which conditions do these tests help evaluate?

- [Perimenopause](https://www.test-well.com/conditions/perimenopause) — Estradiol, FSH, LH and thyroid to make sense of changing cycles and symptoms.
- [Low Testosterone](https://www.test-well.com/conditions/low-testosterone) — Total + free testosterone, SHBG and related hormones for men's hormonal health.
- [Thyroid Problems](https://www.test-well.com/conditions/thyroid-problems) — TSH, Free T4/T3 and antibodies to evaluate an under- or over-active thyroid.

## Which tests, and what do they cost?

| Test or panel | Type | Price | All-in (one item + $6 fee) | Fasting | Results |
| --- | --- | --- | --- | --- | --- |
| [Women's Hormone Panel](https://www.test-well.com/tests/womens-hormone-panel) | Panel (11 tests) | $239.99 | $245.99 | No | 3–5 business days |
| [Men's Hormone Panel](https://www.test-well.com/tests/mens-hormone-panel) | Panel (7 tests) | $199.99 | $205.99 | No | 3–5 business days |
| [Complete Thyroid Panel](https://www.test-well.com/tests/thyroid-complete-panel) | Panel (4 tests) | $109.99 | $115.99 | No | 3–7 business days |
| [TSH (Thyroid Stimulating Hormone)](https://www.test-well.com/tests/tsh) | Test | $26.99 | $32.99 | No | 1–3 business days |
| [Estradiol (E2)](https://www.test-well.com/tests/estradiol) | Test | $35.99 | $41.99 | No | 1–3 business days |
| [Testosterone, Free & Total](https://www.test-well.com/tests/testosterone-free-and-total) | Test | $54.99 | $60.99 | No | 3–5 business days |
| [Cortisol (AM)](https://www.test-well.com/tests/cortisol-am) | Test | $26.99 | $32.99 | No | 2–4 business days |
| [Vitamin D, 25-Hydroxy](https://www.test-well.com/tests/vitamin-d) | Test | $41.99 | $47.99 | No | 1–3 business days |
| [Vitamin B12](https://www.test-well.com/tests/vitamin-b12) | Test | $25.99 | $31.99 | No | 2–4 business days |

Prices are cash-pay; every order adds one $6.00 lab processing fee. Physician authorization included.

## Common questions

### Should I test hormones at a particular time?

Testosterone before 10 a.m.; cortisol within an hour of waking; estradiol on cycle days 2–5 if you still cycle. TSH and vitamin D can be drawn any time.

## Related

- [What blood tests should you get for fatigue?](https://www.test-well.com/symptoms/fatigue)
- [Which blood tests help explain brain fog?](https://www.test-well.com/symptoms/brain-fog)
- [What blood tests should you get for hair loss?](https://www.test-well.com/symptoms/hair-loss)
- [What blood tests check for causes of unexplained weight gain?](https://www.test-well.com/symptoms/weight-gain)
- [All symptoms](https://www.test-well.com/symptoms)
- [Browse by condition](https://www.test-well.com/conditions)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-06. Review policy: https://www.test-well.com/editorial-policy

Canonical page: https://www.test-well.com/symptoms/mood-swings
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.