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Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.

Pubic hair transplantation can improve self-esteem in those with sparse pubic hair.

DHT is crucial for urethral formation, and its disruption can affect masculinization and lead to hypospadias.

Amenorrhea, or the absence of periods, should be evaluated by age 15 or within five years of early breast development, and is most commonly caused by conditions like polycystic ovary syndrome and hypothalamic amenorrhea.

Long-term use of dutasteride for enlarged prostate may worsen blood sugar, cholesterol, and erectile dysfunction.

The document concludes that low-dose oral contraceptives and hormonal therapies can manage perimenopause symptoms and reduce some health risks, but lifestyle changes and disease screening are also important.

Topical finasteride can effectively treat male pattern baldness with fewer side effects than oral use.

The true incidence of post-Finasteride syndrome is unclear, and more research is needed.

Mice without the enzyme HSD17B3 still produce normal testosterone, suggesting they have different ways to make it compared to humans.

Most genital symptoms in prepubertal girls are normal or nontraumatic, not signs of abuse.