# Bone Density Scan in Thyroid Care

URL: https://thethyroidologist.com/tests/bone-density-scan-thyroid/
Section: Tests
Last medically reviewed: 2025-11-15

> Long-standing overactive thyroid or prolonged TSH suppression can thin the bones. When a bone density scan is recommended.

Thyroid hormone affects bone turnover. Long-standing untreated hyperthyroidism and prolonged over-replacement with levothyroxine can reduce bone density, increasing fracture risk — particularly in postmenopausal women and older adults.
A bone density scan (DXA) measures bone mineral density and helps decide whether treatment is needed.

## Why thyroid disease affects bone

Thyroid hormone accelerates bone remodelling, favouring breakdown over formation when levels are persistently high. This can reduce bone mineral density over time.
The effect is most relevant in postmenopausal women, older adults and people on long-term TSH suppression after thyroid cancer.

## Who should be scanned

A DXA scan may be considered in people with prolonged hyperthyroidism, those on long-term suppressive levothyroxine, and those with additional fracture risk factors such as age, menopause, smoking or steroid use.
The decision is individualised with your clinician.

## What the scan involves

DXA is painless and uses a very small radiation dose. You lie on a table while the scanner measures bone density at the hip and spine. The result is a T-score comparing you with a young healthy adult.
The scan takes only a few minutes and requires no special preparation.

## What happens next

If bone density is low, management may include calcium and vitamin D, weight-bearing exercise, review of thyroid dosing, and sometimes bone-protective medication.
Repeat scans are arranged at intervals depending on the result and treatment.

## Frequently asked questions

### Does thyroid disease affect bone density?

Yes — long-standing overactive thyroid and prolonged over-replacement with thyroid hormone can reduce bone density.

### Is DXA safe?

Yes — it uses a very small radiation dose and is painless.

### Will treating my thyroid protect my bones?

Correcting thyroid function removes the excess hormone effect, but other measures such as calcium, vitamin D and exercise also matter.

### How often should I have a scan?

The interval depends on your results and risk factors — often every few years if stable.

## Disclaimer

The content on this website is for general educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional about your specific condition.

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