Hypogonadotropic hypogonadism 

(pituitary or hypothalamus involved)
- nl or decreased LH/FSH

"normal reasons"
- chronic illness/stress
- competitive athletics

"abnormal"
- eating disorders
- tumor (craniopharygioma, pituitary adenoma)
- pituitary infarct (Sheehan syndrome)
- Kallman’s syndrome

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