Hormonally induced hair loss takes place when an enzyme starts to convert the hormone testosterone on the scalp to its less useful version,dihydrotestosterone, or DHT.

• 激素引起的脱发，当一种酶开始把睾丸酮转变为双氢睾丸酮时，头皮就会被大量的双氢睾丸酮占领，然后攻击毛囊并使它缩小，甚至完全消失。