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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.

Finasteride doesn't affect hormone levels in normal men.

Prenatal stress changes how male and female rats enjoy rewards differently, linked to sex hormones.

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

Women's ovarian hormones and adrenal androgens change throughout life, affecting hair loss and health.

First-episode psychosis patients have higher hair cortisol levels, indicating early stress response issues.

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.

Finasteride reduces response to stress and rewards, affecting behavior and mental health.

Using anabolic-androgenic steroids can harm men's reproductive health and increase the risk of heart problems and death.

Certain brain hormones and chemicals are linked to the development of Polycystic Ovary Syndrome.

DA-9401 helps protect rat testis from finasteride damage.

Finasteride exposure harms tadpole reproduction and hormone balance.

People with Parkinson's disease have higher levels of cortisone in their hair, which may indicate chronic stress hormone dysfunction.

A dog with a pituitary tumor developed tertiary hypothyroidism, improved with treatment, but was later euthanized due to neurological issues.

Natural antioxidants like flavonoids and resveratrol may help prevent low testosterone in aging men.

Gut microbes significantly affect brain steroid levels.

Fetal ovaries produce different hormones than adult ovaries, and endocrine-disrupting chemicals may affect this process.

Psychological stress can worsen skin conditions like psoriasis and acne.

Melatonin-loaded nanoparticles improve antidepressant effects and HPA hormone balance better than regular melatonin.

Lowering certain hormone levels improves treatment for hair loss in young men.

The skin acts like an endocrine organ, making hormones that affect skin diseases and respond to stress.

Alopecia areata may involve stress-related changes affecting hormone receptors, leading to reduced cortisol production.

Depression in women with Polycystic Ovarian Syndrome (PCOS) is linked to insulin resistance and hyperandrogenism, and managing these can help reduce depression. Lifestyle changes and Cognitive Behavioral Therapy can be effective treatments.

Cocaine impairs male sexual behavior and alters testosterone metabolism in the brain.

Women with PCOS may have a higher risk of Alzheimer's disease.

The testes produce sperm and hormones essential for male development.

Lifestyle changes and insulin-sensitizing drugs are effective for managing PCOS.

Anorexia nervosa can harm fertility and increase pregnancy risks.

Testosterone affects blood pressure control and inflammation in male rats with endotoxic shock, and blocking certain hormones may help treat it.

The document concludes that sex hormones are crucial for mammalian reproduction, health, and behavior, and require more research for therapeutic use.