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We tend to regard hair only as a reflection of our personal style, but as a living, growing part of our body, it's also tied in to our physiology. "Hair reflects internal changes--things like sickness, nutrition and stress," says dermatologist Paradi Mirmirani, M.D., a faculty member of the American Academy of Dermatology. There are three parts to your hair: the hair shaft (the fiber), the hair bulb (the root) and the hair cycle (the period of rest and regeneration). Most problems are related to one of these three things, says Mirmirani.
我們習慣于把頭發僅僅當作個人風格的一種反映，但是作為我們身體的一個不斷生長的部分，頭發與我們的生理系統息息相關。美國皮膚學會教員、皮膚科醫學博士馬諾莫尼表示：“頭發可以反映出身體內部的變化——比如疾病、營養和壓力?！?我們的頭發包含三個部分：毛干(纖維)，毛球(根部)和毛發周期(休息和再生的周期)。馬諾莫尼表示，大多數的頭發問題都與其中的某個部分相關。
