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15yrs Last period was 6 mos ago, having rapid weight loss?

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I started my period when I was 13, it was completely regular. I am now 15 and have noticed something rather odd... My last period was when I was 14 last September nearly 6 months ago. At first I thought I was just a bit late and nothing to worry about but then I started loosing weight, I am 5"6 and last September I weighed 110 I started to rapidly shed pounds, I now only weigh 90 pounds. My first thought was pregnancy but after 6 negative tests I am fairly certain I'm not pregnant. I don't know what it could be.. I don't have an eating disorder and I am starting to get worried any help would be greatly appreciated! Thank you

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replied February 24th, 2012
Menstruation Answer A31918

Welcome to ehealthforum and thanks for writing

Irregular periods are quite common in girls during the puberty due to hormonal changes going in the body and as the years pass by they regularize by themselves.But a sudden change in the cycle along with weight loss can be indicative of aome underlying issues as Hormonal imbalance due to any pathology,Thyroid disorder,endocrine causes,pelvic infection etc.
You require a detailed investigations as USG scan and Hormonal Analysis,thyroid profile which would help in ruling out the cause.Since it has been quite long you did not have periods I would advise you to visit a Gynaecologist for evaluation so that the excat diagnosis can be made and treatment started accordingly.
Take care!

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