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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.

The document concludes that menopause should be seen as a natural part of aging and managed with personalized care and informed choices.

Enzyme purified and characterized for minoxidil sulphation in rat liver.

Different populations have distinct hair structures related to their ancestry.

Changes in keratin affect skin health and can lead to skin disorders like blistering diseases and psoriasis.

Behavior therapy and medications, especially clomipramine, can help reduce hair pulling in people with trichotillomania.

NcoA4 may have roles beyond helping control gene activity, possibly affecting cell behavior and stability.

Common Black hair care products may affect hormone levels and potentially impact health, especially in reproductive and metabolic areas.

Finasteride inhibits enzyme activity in rhesus macaques, suggesting they're useful for evaluating similar drugs.

Adding human blood vessel cells to hair follicle germs may improve hair growth and quality.

Mice with LSS deficiency showed hair loss and cataracts, similar to humans, and can help in understanding and treating this condition.

Epidermal stem cells have various roles in skin beyond just maintenance, including forming specialized structures and aiding in skin repair and regeneration.

A specific protein in chicken embryos links early skin layers to feather development.

Cognitive-behavioral therapy is the best treatment for hair-pulling disorder, and combining it with other therapies could improve results.

Most hair loss disorders can be accurately diagnosed and treated in an outpatient setting.

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.

Hes1 protein is important for hair growth and regeneration, and could be a potential treatment for hair loss.

Green tea may help with skin health and protect against UV damage, but more research is needed to confirm its safety and effectiveness.

Non-immune factors play a significant role in alopecia areata.

Older people's sweat glands are less effective at helping skin wounds heal due to weaker cell connections.

Intu gene is crucial for hair follicle formation by helping keratinocytes differentiate through primary cilia.

Hair shaft dysplasias are abnormal hair conditions that can be inherited or acquired and may signal other health issues, with limited treatment options available.

Antler velvet hair and body hair of red deer have different structures that help with protection and insulation.

Reducing copper (II) ion levels in hair can decrease hair damage.

Alopecia areata has a complex genetic basis that was not fully understood as of 2001.

Insulin helps heal corneal wounds and nerves in diabetic mice by activating the Wnt signaling pathway.

Finasteride effectively treats central serous chorioretinopathy.

Skin doctors should recognize and treat conditions like hair-pulling and skin-picking early, often using therapy and medication, to help 50-70% of patients.

Corkscrew and cigarette-ash-shaped hairs in tinea capitis are caused by internal hair degradation and external resistance.

Monotreme hair structure and protein distribution are similar to other mammals, but their inner root sheath cornifies differently, suggesting a unique evolution from reptile skin.