Menarche is the name for the normal first period of a young woman, usually in puberty. It is only a disorder if it fails to occur. The absence of menarche may indicate some sort of fertility disorder. Failure to menstruate generally is called amenorrhea, but absence of even the first period is called primary amenorrhea. Failure to ovulate is called anovulation, which is a common cause. Another possibility is imperforate hymen.

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