Hello. Welcome to ask the doctor.
Hair thinning and hair fall can occur in both hyperthyroidism and hypothyroidism.
But usually in males, hair thinning occurs as a part of Androgenetic alopecia.
It is a kind of hair loss due to male hormones dihydrotestosterone leading to hair thinning and ultimately hair fall. It is also known as Male pattern baldness.
I hope I am able to solve your query.
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