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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.

Continuous light exposure in rats leads to PCOS-like symptoms and suggests sleep habits might affect the disorder's development.

Wnt/ß-catenin signaling is crucial for regulating skin stem cells and hair growth, with the right levels and timing needed for proper function.

Pulsed-intense light can significantly reduce hair, with effectiveness depending on treatment number and timing, and has mild side effects.

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.

Ruby laser pulses best destroy hair follicles during the growth phase and effectiveness varies with laser intensity; melanin is key for targeting, and timing treatments can improve results.

Goat reproductive activity and coat growth are affected by light and temperature, with temperature altering prolactin levels and hair growth, but not melatonin or estrus onset.

The document concludes that the hair cycle is a complex process involving growth, regression, and rest phases, regulated by various molecular signals.

The document concludes that the hair cycle is a complex process involving growth, regression, and rest phases, regulated by various molecular signals.

Alopecia common in teens, may indicate endocrine issue, minoxidil effective treatment.

LPA3 signaling in the uterus is crucial for placental formation and fetal development.

Rat vibrissa follicles are useful for studying hair growth cycles, especially the transition from pro-anagen to anagen.

Minoxidil helps prevent stress-caused hair loss in mice.

A 24-month-old Nigerian girl developed early puberty with no family history, needing treatment her family couldn't afford.

Targeted therapy for skin cancer is complex due to the role of the hedgehog pathway in both cancer and hair growth.

Blocking BMP signaling causes hair loss and disrupts hair growth cycles.

The article concludes that hair loss is a common side effect of drugs treating skin cancer by blocking the hedgehog pathway, but treatment should continue, and more selective drugs might prevent this side effect.

Fat tissue and a specific protein are crucial for healthy hair growth and maintenance.

The PLP2 gene affects cashmere fiber quality in goats and is linked to hair growth and loss.

Wild African goats have genetic adaptations for surviving harsh desert conditions.

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

Sex hormones affect hair and feather growth and may help manage alopecia and hormone-dependent cancers.

Disrupting natural body clocks increases the risk of developing type 2 diabetes.

Eating high-glycemic and dairy foods can increase hormones that may cause acne and other health issues.

Amenorrhea is relatively rare and initial testing should check FSH, TSH, and prolactin levels.

Blocking prolactin increases the activity of secondary hair follicles in cashmere goats.

Low zinc levels may be linked to the return of gynecologic cancers.

A pregnant woman's skin condition improved after giving birth, possibly due to high estrogen levels during pregnancy.

Postmenopausal ovary stromal cells have a unique makeup and limited steroid production, suggesting androgens come from the adrenal gland.

Platelet-Rich Plasma (PRP) increases the number of new hair follicles and speeds up hair formation.