2 doctors weighed in:

Please explain why would someones eyebrows start to fall out?

2 doctors weighed in
Dr. Jan Lei Iwata
Ophthalmology
1 doctor agrees

In brief: Look at thyroid

There can be hormonal reasons why the outer third of an eyebrow hair has falling out.
If it's the entire eyebrow, then you need to go to your PCP and investigate this further.

In brief: Look at thyroid

There can be hormonal reasons why the outer third of an eyebrow hair has falling out.
If it's the entire eyebrow, then you need to go to your PCP and investigate this further.
Dr. Jan Lei Iwata
Dr. Jan Lei Iwata
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