Young people go through a period of fast growth, called puberty.

青少年会经历一段快速成长期，称为青春期。

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In many cases, as in girls before puberty, or during pregnancy, breastfeeding or the menopause, this is normal and is called physiological amenorrhoea.

在许多情况下，作为在女孩的青春期之前，或在怀孕期间，哺乳或绝经期，这是正常的，也是所谓的生理闭经。

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Sometimes, though, people pass this normal age range for puberty without showing any signs of body changes. This is called delayed puberty.

然而有时，有些人过了一般发育年龄，却丝毫没有身体变化。这个我们称作“迟来的青春期”。

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One, called Gorlin's syndrome, sometimes causes basal cell skin cancer to blanket patients as soon as they hit puberty.

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