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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.

Isotretinoin can cause gynecomastia by lowering testosterone levels.

SOX9 is essential for the development of various organs and hair follicles.

Estrogen increases blood vessel growth factor production, while testosterone blocks this increase.

The enzyme 5α-reductase type 1 is important for blood vessel development and fertility in the uterus.

Dermatologists are crucial in providing personalized care for patients with sex development differences.

The pituitary gland is crucial for normal mink fur cycles.

During late pregnancy in rats, hormonal changes increased certain GABAA receptors in specific brain cells.

Reduced neurosteroids and growth issues can harm fetal brain development, especially in males.

Testosterone in older women can increase bone density, muscle mass, fat mass, improve memory, and boost libido, but may cause nipple color changes.

Antiandrogens are used to manage polycystic ovary syndrome by reducing androgen levels or controlling their effects, often combined with lifestyle changes and other treatments.

More research is needed to understand how testosterone is maintained in adult males.

The fuzzy gene is crucial for controlling hair growth cycles.

Chinese women with PCOS have higher androgen levels, which change with age and weight.

Treatment during development affects hormone balance and sexual behavior in male rats.

Men with isolated hypogonadotropic hypogonadism have partial steroid deficiencies, while those with panhypopituitarism have severe deficiencies.

Long-term use of finasteride in women can cause hormonal changes, DNA damage, and menstrual issues.

CircAGK affects cell death in hair cells by controlling the miR-3180-5p/BAX pathway, which can lead to hair loss.

Hormonal contraceptives and therapies regulate organ functions and treat various conditions.

A young woman had a rare, aggressive ovarian tumor that was hard to diagnose and treat, leading to disease progression despite treatment.

Older men with high total testosterone might not show symptoms, while younger men with hyperandrogenism may experience hair loss or acne.

Breathing in newborn rats is affected differently by hormones based on their sex.

Gender-affirming hormone therapy changes hair growth in transgender people, with feminizing therapy reducing hair and masculinizing therapy increasing it, but sometimes additional treatment is needed.

FOXA1 and CCL2 genes are more active in women with PCOS, varying by phenotype.

3α-AdiolG is a good marker for androgen activity in women with excessive hair growth and decreases with anti-androgen treatment.

A low-glycemic diet improved hormone levels and well-being in overweight women with high androgen levels.

A woman with Kallman's syndrome also developed alopecia universalis, a condition not previously linked to Kallman's.

Testosterone therapy seems safe and effective for transgender men with proper care, but more long-term research is needed.

Birth control pills increase certain receptor activities in female gerbil prostate glands and can lead to prostate changes.

Diet changes hormone levels in pregnant ewes by affecting metabolism, not placental synthesis.