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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.

Hair loss caused by genetics and hormones; more research needed for treatments.

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.

Testosterone is important for men's sexual function, may help some women's sexual desire, while other hormones and neurotransmitters also play complex roles in sexual behavior.

Testosterone replacement may improve sexual desire and bone health in women with low androgen levels, but more research is needed on its long-term safety.

More hair loss leads to higher risk of psychosexual disorders, especially in women.

Cyproterone acetate is the preferred treatment for women's hyperandrogenism when estrogen/progestogen use is safe.

Hidradenitis suppurativa is caused by genetic factors, inflammation, bacteria, hormones, and lifestyle factors like obesity and smoking.

Products should be called 'sperm-safe' only after thorough, well-designed tests.

The AndroCoV Clinical Scoring is a quick, accurate, and free tool for diagnosing COVID-19.

Lymphatic vessels are essential for health and can be targeted to treat various diseases.

Hair analysis is better than urine and blood for detecting past drug use.

Dermal Papilla cells are a promising tool for evaluating hair growth treatments.

Saw palmetto is an effective natural treatment for hair loss with minimal side effects.

Climate-related nutritional stress may cause hair loss in juvenile male Guadalupe fur seals.

Sex hormones like estrogen and testosterone may affect COVID-19 severity differently in men and women, potentially influencing prevention and treatment strategies.

Skin aging reflects overall body aging and can indicate internal health conditions.

More research is needed to understand how testosterone is maintained in adult males.

New tools show that in fish, NPY increases feeding and somatostatin decreases it.

Alopecia in captive rhesus macaques is affected by season, sex, age, housing, and stress, with complex links between stress hormones and hair loss.

Women with PCOS are more than twice as likely to develop nonalcoholic fatty liver disease.

Finasteride treatment changes urine metabolomics and steroid signatures, potentially monitoring effectiveness but may cause sexual side effects.

Hormonal contraceptives can help treat acne by affecting sebum production and androgen levels.

Betacoronaviruses, like COVID-19, may cause hormone system dysfunction and affect disease susceptibility and severity.

Diagnosing hyperandrogenism in women is complex and requires accurate testing methods and consideration of SHBG levels.

Men and women respond differently to drugs for COVID-19, high cholesterol, and diabetes, which suggests a need for personalized treatments.

Fear of hair-related issues causes significant mental distress, especially in high-stress women.

The guideline recommends mental health involvement in diagnosing gender identity disorder and outlines hormone and surgical treatment protocols, emphasizing safety, informed consent, and long-term monitoring.

The conclusion is that while oral contraceptive pills are effective for PCOS-related high androgen levels, new treatments with fewer side effects are needed.

Diet changes can protect against harmful environmental effects on fetal development.