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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.

PCOS symptoms change with age; younger women have higher androgen levels and less metabolic issues, while older women face more metabolic challenges despite milder PCOS symptoms.

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

The osteopontin gene is active in a specific part of rat hair follicles during a certain hair growth phase and might affect hair cycle and diseases.

Trichotillometry is a reliable method to measure hair strength and assess hair loss treatments.

Scalp cooling is recommended to prevent chemotherapy-induced hair loss, but no effective drugs are available.

Growth factors and cytokines are important for hair growth and could potentially treat hair loss, but more research is needed to overcome challenges before they can be used in treatments.

Leptin affects skin and hair health and may worsen some skin conditions, but more research is needed to understand its full impact.

Taking spironolactone and linestrenol for androgen excess can lead to lower bone density in young women.

Removing one ovary helped treat a woman's severe PCOS symptoms when medicine didn't work.

A substance called Vascular Endothelial Growth Factor can protect certain hair follicle stem cells from damage caused by androgens, suggesting a new possible treatment for hair loss.

Special cell particles from macrophages can help hair grow.

The document concludes that for hair and feather growth, it's better to target the environment around stem cells than the cells themselves.

AHCC reduces hair loss and liver injury caused by chemotherapy in rodents.

Melatonin may help treat PCOS symptoms in rats.

Aging in hair follicle stem cells leads to hair graying, thinning, and loss.

Smad1 and Smad5 are essential for hair follicle development and stem cell sleepiness.

Angiogenin helps hair grow by stimulating cell growth and blood vessel formation.

Testosterone therapy may slightly increase sexual desire in women with HSDD but lacks broad recommendation due to safety concerns and limited approval.

The guideline refines PCOS diagnosis, promotes a healthy lifestyle, reviews treatments, and stresses long-term follow-up.

Cats with Feline Symmetrical Alopecia can regrow hair with proper treatment based on the specific cause, including diet, medication, or stress management.

IGF-1 increases whisker growth in transgenic mice.

Women with PCOS have similar bone density to healthy women, but those who are obese have higher bone density at some body sites.

Latanoprost-loaded nanotransfersomes could help treat hair loss by promoting hair growth.

Chronic Telogen Effluvium is a hair loss condition in middle-aged women that usually doesn't lead to complete baldness.

Effective acne management in PCOS includes hormone therapy, metformin, isotretinoin, weight loss, diet, exercise, and personalized treatment plans.

Human hair contains more glycosaminoglycans in children than adults, and these compounds decrease with age, possibly affecting hair thickness.

Pigs without the Hairless gene showed skin and thymus changes, useful for studying human hair disorders.

Finasteride microspheres help reduce hair loss for up to eight weeks with fewer side effects.

650 nm red light helps hair grow and prevents hair loss by affecting certain genes and biological processes.