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Testosterone can both promote hair growth and cause baldness by affecting hair growth signals.

The chapter explains the causes of excessive hair growth and masculinization in women and how to measure hormone levels related to these conditions.

Hair loss in Androgenetic alopecia (AGA) is due to altered cell sensitivity to hormones, not increased hormone levels. Hair growth periods shorten over time, causing hair to become thinner and shorter. This is linked to miscommunication between cell pathways in hair follicles. There's also a change in gene expression related to blood vessels and cell growth in balding hair follicles. The exact molecular causes of AGA are still unclear.

All women with significant unwanted hair growth have hormonal imbalances, often from polycystic ovary syndrome.

Most women with excessive hair growth have a hormonal cause.

Women with androgenetic alopecia (hair loss) have normal prostate specific antigen levels but higher testosterone levels.

Insulin resistance and high male hormone levels are major causes of Polycystic Ovary Syndrome.

Antiandrogen therapy may be beneficial for women with hidradenitis suppurativa.

Antiandrogen therapy may help treat hidradenitis suppurativa.

Hair follicles are hormone-sensitive and involved in growth and other functions, with potential for new treatments, but more research is needed.

Effective hair loss treatment in women requires correct diagnosis and can include medications like minoxidil, antiandrogens, and treatments for underlying conditions like PCOS.

SAHA syndrome is a condition in women involving skin and hair issues, often related to hormonal imbalances, and is treated based on the underlying cause.

Hirsutism is excessive hair growth in women often caused by polycystic ovarian syndrome, and identifying the cause is important for managing associated health risks.

Birth control pills help treat skin and hair growth problems linked to high male hormone levels.

Birth control pills can help reduce mild to moderate acne in women.

Human skin can make serotonin and melatonin, which help protect and maintain it.

Low-dose flutamide helps reduce excessive hair growth and is even more effective with birth control, without bad effects on blood fats.

17α-estradiol is a safe estrogen that might protect the brain and doesn't cause feminization, needing more research for treating brain diseases.

Men and women experience skin aging differently due to changes in sex hormone levels with age.

Hormonal imbalances, often indicating conditions like PCOS, are common in women with hard-to-treat acne, and a treatment approach addressing these imbalances may be needed.

About one-third of Saudi women with female pattern hair loss also have thinning hair at the back of their head.

Men with male pattern baldness don't necessarily have high levels of Dehydroepyandrosterone-sulfate, and there's no link between its levels and the severity of hair loss.

Men with hair loss don't necessarily have higher levels of the hormone DHEA-S, but this hormone tends to decrease with age.

The document concluded that more research is needed to understand how estrogen affects the enzyme involved in hirsutism development.

Natural compounds from Chinese herbs may safely promote hair growth and treat common hair loss.

Androgenetic alopecia, or hair loss, is caused by a mix of genetics, hormones, and environment, where testosterone affects hair growth and causes hair to become smaller and grow for a shorter time.

Long-term use of finasteride and dutasteride can cause serious health issues like diabetes and liver problems.

Trichoscopy is an effective, noninvasive method for early diagnosis of Female Pattern Hair Loss.

The document discussed hair loss causes and treatments but didn't give a final summary.

Prolactin may play a significant role in skin and hair health and could be a target for treating skin and hair disorders.