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What to know about eyebrow hair loss

Normal aging processes
Woman looking at her eyebrows in the mirror
The aging process or hormonal imbalances may cause eyebrow hair loss.

As people get older, they may notice hair thinning or loss affecting the head, eyebrows, eyelashes, and elsewhere.

Over time, some hair follicles stop producing hair, and the hair shafts become finer. The hair also begins to lose its color, becoming white or gray.

This type of hair loss is a normal part of getting older.
Hormonal imbalances

An imbalance of thyroid hormones can cause eyebrow hair to fall out. This is linked to the following conditions:

hyperthyroidism, a condition wherein the body creates too much thyroid hormone
hypothyroidism, in which the body does not create enough thyroid hormone

Both types of thyroid imbalance are linked to eyebrow hair loss. Specifically, in hypothyroidism, a person may notice hair loss in the outer third of the eyebrow, which is the thinnest part that points toward the ears.

Other symptoms of thyroid disorders include:

dry, pale skin or moist, velvety skin
a swelling in the neck (a goiter)
coarse, dry, and brittle hair
a dry, itchy scalp
thick, dry, brittle nails

Thyroid-related hair loss is usually temporary, and the hair should return to its usual fullness once thyroid levels return to normal.

Doctors can prescribe medication to balance thyroid levels.
Autoimmune conditions

Autoimmune conditions develop when the immune system mistakenly attacks its own body cells. The immune system may attack healthy cells that contribute to hair growth. This can lead to thinning hair, patches of hair loss, or hair falling out.

Autoimmune conditions that can cause hair loss include:

alopecia areata, a condition that causes patches of hair loss on the head and other areas of the body, which can include the eyebrows
frontal fibrosing alopecia, a form of alopecia that mainly affects people after menopause; eyebrow hair loss occurs before scalp hair loss in around 39% of cases
discoid lupus erythematosus, a chronic autoimmune condition that causes skin sores, scarring, and hair loss on the face and eyebrows