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	Puberty: Your Changing Body Sat Aug 13, 2011 3:08 am

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DoctorNutopia

萬人迷

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Post subject: Puberty: Your Changing Body

Puberty: Your Changing Body

“Am I normal?” That can be a nagging question once your body starts changing during puberty. And guess what? Wondering if you’re normal is a normal part of puberty.

Chances are your body development is very normal. But there’s so much going on at once -- breast development, raging hormones, hair in new places, menstrual periods. Just knowing what to expect can help put your mind at ease.

This article fills you in on what body changes to expect and why they happen. It also includes tips on how to handle the changes so you can grow into your new body with confidence.

Intro to Puberty Puberty is kind of a hormone party in your body, beginning with gonadotropin-releasing hormone, or GnRH for short. Your body releases GnRH, which in turn causes two other puberty hormones -- called LH and FSH-- to be released in your bloodstream. LH and FSH stimulate your ovaries to start producing the female hormone estrogen, and off you go! Your girl’s body starts changing into a woman’s body. Your body is preparing itself to conceive and carry a child. All these surging hormones can also make your mood go up and down.

Though it may sometimes seem as if your body is out of control during puberty, all the changes actually occur in predictable stages.

Puberty generally starts between the ages of 8 and 13 and can last a few years to five years or more. Girls who are obese may start puberty earlier than 8 years old. On the other hand, girls who are anorexic or who are very athletic and have low body fat -- such as gymnasts, ballet dancers, runners, and figure skaters -- may start puberty late. But every girl experiences puberty according to her own biological clock. “Research shows that there’s a huge variation of ‘normal,’” says Kathy McCoy, MD, a psychiatrist who co-wrote The Teenage Body Book and was the “Sex and Your Body” columnist for Seventeen magazine. “In many cases, it has to do with family history. If your mother started her periods late, you may too.”

When should you be concerned about your body development?

“If you haven’t had any breast development by age 12, your doctor will want do a physical exam and some blood tests to check on your hormones,” says Melisa Holmes, MD, an obstetrician-gynecologist and coauthor of the Girlology book series. “And even though it's normal to start menstruation as late as age 16, if you aren’t menstruating by 15 years old, she will also want to do a full physical exam.”

Growth and Weight Gain During Puberty Your body grows faster during puberty than at any other time in your life besides infancy. During a growth spurt -- a period of fast and furious growth -- you may get four or more inches taller in a year.

http://teens.webmd.com/girls-puberty-10/puberty-changing-body?src=RSS_PUBLIC

	Puberty: Your Changing Body Sat Aug 13, 2011 3:08 am

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