1·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。
2·Secondary amenorrhoea affects about 3% of girls.
中学闭经影响的3 %左右的女孩。
3·Secondary amenorrhoea implies a gynaecological disorder or a general cause or disease.