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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.

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.

COVID-19 may harm male fertility and damage the reproductive system.

Childhood ptosis can vary from a minor cosmetic issue to a serious condition and may signal other health problems.

5α-Reductase inhibitors can negatively affect male sexual function and, in some cases, significantly reduce sperm count, but these effects may be reversible.

Curcumin may help reverse aging by targeting specific genes.

Fetal-maternal stem cells in a mother's hair can help with tissue repair and regeneration long after childbirth.

Selective breeding caused the unique curly hair in Mangalitza pigs.

Current automatic metrics for long-form question answering don't align with human preferences; a multi-faceted evaluation approach is needed.

Researchers identified genes in scalp hair follicles that may affect hair traits and hair loss.

Finasteride causes harmful organ changes in female mice.

Ovulation disorders are a major cause of infertility and menstrual problems in women.

The study found that giant pandas have more melanin in black hair follicles than white, with gene expression differences that could affect hair color and skin health.

Father's finasteride use may affect son's fertility and testicular function.

Finasteride may improve sperm count in subfertile men with low sperm count.

Review finds no permanent solution for female hair loss.

Review determines effective, safe treatments for female hair loss.

ChatGPT 4.0 and Gemini 1.5 Flash are effective for educating patients about androgenetic alopecia, while Deepseek R1 is less reliable.

The G allele of IFITM3 rs12252 is linked to more severe COVID-19.

Xiangdong black goats have moderate genetic diversity, minimal inbreeding, and important genes for reproduction, immunity, and other traits.

A 19-year-old male with delayed puberty was successfully treated for a condition that prevents normal hormone production.

HNG may help prevent the negative effects of chemotherapy on sperm production and white blood cell counts.

PCOS may be influenced by factors in the blood, not just the ovaries.

Adult hair follicle cells can create new hair follicles from corneal cells with the right support.

Genetic factors influence hair traits like shape, color, and greying in Latin Americans.

Hair loss needs more research for better treatments.

Women with PCOS have a higher risk of severe COVID-19 due to related health issues.

The report concludes that PCOS is mainly a condition of excess male hormones and its definition may change as new information is discovered.

PCOS is a complex condition with major health impacts, needing more research for better diagnosis and treatment.