How can hyperthyroidism cause hair loss?

By affecting metabol: Hyper thyroidisum results in a speeding up of metabolic processes this result in hair loss in many cases.

Thyroid = Hair Loss: In our experience treating over 15,000 men and women with hair loss since the 1990's, we've seen a strong connection between hyper-thyroid, hypo-thyroid, thyroid medications & hair loss. Thyroid imbalance and thyroid treatments VERY OFTEN causes excessive hair shedding & hair loss. Sometimes this occurs along w/ hereditary hair loss. Diagnosis & treatments are available from ABHRS-certified docs.