Humidity, temperature, altitude, pollution, and climate conditions have different effects on skin and hair.

湿度、温度、海拔、污染和气候条件对皮肤和头发有不同程度的影响。

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Some medical conditions, such as polycystic ovary syndrome and Cushing's disease, can result in increased hair growth.

一些病症也会引起毛发的增长，如多囊卵巢综合症，库兴氏病。 药物也可能引起毛发生长的变化。

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Air humidity may not be top of the list to monitor when you are away, but long exposure to extreme conditions and you could be left with dry hair and skin.

外出度假时，空气湿度或许并不是你的关注点之一，但长时间处于极端的天气状况下可能会让你的头发干枯、皮肤干燥。

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Some of the more common side effects of weight-loss surgery can be difficulty digesting starchy foods and protein, which can lead to other physical conditions including hair loss, fatigue, swelling and muscle weakness.

CNN: Surgery helps woman drop 135 pounds, 10 dress sizes

Sure enough, our Dove Hair team did the research and found that many new moms experienced poor hair conditions.

FORBES: Brandon Gutman: Where do you go to get insights and ideas?

Inflammatory and hair loss conditions of the scalp are rare but can also cause itching.

CNN: Why is my scalp so itchy?