推荐回答（1个）
有些人的月经来的太过于频繁了，明显就是提前了很多的时间来的，并且周期还非常的短，这就等于别人来一次月经的时间你来了两次月经，对身体的伤害肯定是非常的大的。那么月经半个月来一次的原因到底是什么呢?
月经半月一次的原因
月经量多可能是由于炎症引发的，这里说的炎症是指妇科类的炎症，可能是阴道炎、盆腔炎或者是子宫内膜异位导致的月经量过多，因为这些妇科疾病都会让局部的血管变得非常的脆弱，在月经到来的时候才会出现血多不容易凝止，这也就引发了月经量大而且月经期比较长。很多女心在进行性生活的时候没有过多的注意，不洁净的性生活很容易导致受到感染，或者是子宫环上的不正确，容易引起月经周期缩短、月经量会明显增多，之后还可能会往往伴随着月经后淋漓出血的一些其他的情况，因此平时注重自己的个人卫生和性生活卫生才能够有所保障。
如果量少的话，有可能是排卵期出血量多，那就是有问题了，建议你及时到医院就诊，在医生的指导下做具体的治疗。如果偶尔一次出现这种情况。应该说是没有什么问题的。建议你再观察一次下次月经的情况。暂时不需要特殊的处理。如果经常这样的话有可能是一个月经周期的紊乱。我建议你去医院做一个b超看看。必要的情况下，可以吃一点断血流颗粒试试看。
子宫内膜异位症：会影响子宫肌层收缩或内膜增强，子宫内膜增强，就会导致内膜脱落时间延长，导致月经周期过多或经期延长。放置节育器：放置节育器，子宫内膜受环的压迫，细胞发生炎性浸润，也易引起经期过长。子宫平滑肌瘤：尤其是子宫粘膜下肌瘤，这是因为子宫腔面积扩大，导致子宫收缩异常，可能导致月经周期过多和经期过长。
月经不规则的危害
月经不调它是一种很常见的妇科病，但是病情严重者会导致不孕，因此应积极治疗。月经不调则是表现为月经周期提前或错后7天以上或先后无定期，月经量少或点滴即净和月经量多或行经时间超过8天以上者。由于月经来时常常是无定期，因此常常让女性朋友措手不及。更为严重的是如果长期以往，还会导致阴道炎、子宫肌瘤、卵巢囊肿甚至不孕等严重后果。
月经失调是指月经周期过短、过长、紊乱、闭经、经量过多、严重痛经等等。由于不良的生活习惯和紧张生活环境的影响，造成多数女性月经不调。月经失调是女性常见的情况，虽然不算大病，但它可以严重危害女性的身体健康，长时间存在月经不调，就会引起其它并发症，甚至导致不孕，所以女性朋友们切勿对其忽视。如果要是月经来的比较频繁的话，这种就容易引起贫血，不孕等风险。
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