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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.

Skin problems in older people can indicate hormonal diseases, nutritional deficiencies, or conditions like diabetes, menopause, and HIV.

The document concludes that accurate diagnosis of male and female gonadal disorders is crucial for effective treatment and better patient outcomes.

Stress can worsen skin and hair conditions by affecting the skin's immune response and hormone levels.

Alopecia areata is an autoimmune condition causing hair loss, influenced by genetics, stress, and diet, and may be prevented by a high soy oil diet.

The NAMS 2014 recommendations guide healthcare providers on treating health issues in midlife women, emphasizing individualized care and informed decision-making.

Androgens can both increase and decrease hair growth in different parts of the body.

Growth factors are crucial for hair development and could help treat hair diseases.

Human hair follicles produce and respond to erythropoietin, helping protect against stress.

The document explains how the male reproductive system works, its role in making testosterone, and how conditions like obesity can disrupt it, leading to low testosterone and fertility issues.

Different women's hair and skin glands respond to hormones in varied ways, which can cause unwanted hair growth even with normal hormone levels, and more research is needed to treat this effectively.

Mice without Vitamin D receptors have hair growth problems because of issues in the hedgehog signaling pathway.

Menopause significantly reduces skin collagen, leading to thinner, less elastic skin, and hormone replacement may help but requires careful consideration.

Small changes in hormones can significantly impact health, showing the importance of sensitive testing for chemicals that disrupt hormones.

The cause of atypical Cushing's syndrome in dogs, possibly linked to sex hormones, is not yet proven.

Skin changes can indicate hormonal imbalances and help diagnose endocrine disorders.

1α,25-dihydroxyvitamin D3 directly affects cartilage growth and development.

Most patients with telogen effluvium had low iron and vitamin D levels; iron supplements were commonly prescribed.

More than half of patients who had acromegaly surgery experienced hair loss, with varying degrees of recovery.

The document concludes that parathyroid diseases have a range of clinical features and outcomes, with some conditions being treatable and others having a high risk of mortality.

Patients with the same genetic mutation for vitamin D-resistant rickets showed different symptoms but all improved with treatment except for hair loss.

Cinacalcet may help treat hereditary vitamin D resistant rickets safely.

Boosting mitochondrial energy production with supplements like acetyl-L-carnitine may improve aging-related cellular function and health conditions.

Hair loss from weight-loss treatments is usually temporary and reversible.

The document concludes that alopecia has significant social and psychological effects, leading to a market for hair loss treatments.

Endocrine disorders can cause various skin and hair issues.

Vitiligo is a skin condition causing white spots, more common in women, often starts before age 20, and can affect mental health.

Androgens can cause hair growth in some areas and hair loss on the scalp.

PCOS starts in adolescence with hormonal issues, leading to adult health problems, and early treatment is crucial.

The document concludes that early recognition and treatment of PCOS in adolescents is crucial for managing symptoms and long-term health risks.