Thyroid In Women Thyroid Reference Guide
Thyroid Reference Guide
Hair thinning or hair loss can be influenced by various factors.

Hair Thinning or Hair Loss

Hair thinning or hair loss can be influenced by various factors, one of which is hormonal imbalances. Hormones play a crucial role in regulating hair growth and can impact both the hair’s life cycle and its quality. The major hormones affecting hair growth are androgens (e.g., testosterone, dihydrotestosterone), thyroid hormones, and stress-related hormones (e.g., cortisol). Imbalances in any of these hormones can lead to hair thinning or loss. Here is a detailed explanation of the connection between hormonal imbalances and hair issues, along with reference links for further reading.


Androgens are male hormones, but they are also present in females in lower concentrations. The primary androgens affecting hair growth are testosterone and dihydrotestosterone (DHT). DHT is a derivative of testosterone, which is formed when testosterone interacts with an enzyme called 5-alpha reductase. In some people, high levels of DHT can cause hair follicles to shrink, resulting in hair thinning and hair loss, a condition known as androgenetic alopecia.

Thyroid Hormones:

Thyroid hormones, specifically thyroxine (T4) and triiodothyronine (T3), are essential for normal hair growth. An imbalance in thyroid hormone levels, either hypothyroidism (low thyroid hormone levels) or hyperthyroidism (high thyroid hormone levels), can lead to hair thinning and hair loss. Hair loss due to thyroid imbalances is usually diffuse and occurs across the entire scalp.

Stress-Related Hormones:

Stress can lead to the release of cortisol, a hormone that, when present in high amounts, can negatively affect hair growth. High cortisol levels can cause a disruption in the hair growth cycle, pushing more hair follicles into the resting phase (telogen) and eventually leading to hair shedding, a condition known as telogen effluvium.

Other Hormonal Imbalances:

In addition to the above-mentioned hormones, imbalances in other hormones, such as insulin, growth hormone, or prolactin, can also contribute to hair thinning or hair loss. Additionally, hormonal changes during pregnancy, menopause, or due to the use of oral contraceptives can lead to temporary hair loss in some women.

Hormonal imbalances can have a significant impact on hair thinning or hair loss. The primary hormones affecting hair growth are androgens, thyroid hormones, and stress-related hormones, while other hormonal imbalances can also contribute to hair issues. It is essential to consult with a medical professional if you suspect hormonal imbalances to be the cause of your hair loss, as proper diagnosis and treatment can help manage the condition.