Thyroid Causes Hair loss

29 October, 2025

Introduction

Thyroid causes hair loss when hormonal imbalance disrupts the body’s normal functions. Low or high thyroid hormone levels can weaken hair roots, leading to thinning and hair fall. In this post, you’ll learn how thyroid imbalance affects hair health and the best ways to prevent and manage it.

Thyroid and hair loss relationship

1. Thyroid hormones control hair growth
The hormones T3 (Triiodothyronine) and T4 (Thyroxine) secreted by the thyroid gland control the activities of our body’s cells, including hair growth and repair processes. When these hormones are out of balance (excessive or under-secretion), hair growth stops or becomes weak.

2. Hypothyroidism (when thyroid hormones decrease)
Hair becomes dry, rough and brittle
Hair starts to thin
Hair roots become weak
The outer part of the eyebrows becomes thin
New hair does not grow

3. Hyperthyroidism (when thyroid hormones increase)
Hair becomes excessively oily and soft
Hair on the head decreases
Hair density decreases
Hair on other parts of the body may also fall

4. Autoimmune Thyroid Disorders and Hair Loss
Such as Hashimoto’s Thyroiditis or Graves’ Disease – These diseases confuse the body’s immune system, which attacks the hair follicles. As a result, hair falls out or bald patches appear all over (Alopecia).

Things to do to reduce hair loss

✅ Get a thyroid test (T3, T4, TSH) — knowing the exact cause is most important.
✅ Take thyroid medication regularly as advised by your doctor — do not stop or change the medication on your own.
✅ Eat a balanced diet – eat foods rich in iron, zinc, biotin, selenium, and protein.
✅ Reduce stress – do yoga, meditate, and get enough sleep.
✅ Avoid chemical-containing hair products.
✅ Also check the levels of iron, vitamin D, and B12 in the blood – their deficiency increases hair loss.

Conclusion

Thyroid causes hair loss, but the good news is that it can be managed effectively. With proper treatment, a nutritious diet, and a balanced lifestyle, you can restore healthy hair growth. Remember—a healthy thyroid means healthy hair and a healthy life.

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