Androgens, such as testosterone (T), dihydrotestosterone (DHT), and their prohormones dehydroepiandrosterone sulfate (DHEAS) and androstenedione (A) are the key factors in the growth of terminal hair.
The female sex hormone oestrogen makes body hair fine and soft. Androgens are male sex hormones, including testosterone, which are responsible for masculine characteristics such as facial hair and coarse body hair. A woman's ovaries and adrenal glands naturally make a small amount of androgens.
Estrogen and Progesterone
These hormones also help with hair growth. Estrogen and progesterone can help keep your hair in the growing (anagen) phase. Therefore, these hormones can help your hair stay on your head longer and may even help your hair grow faster.
In vitro, testosterone and estrogen inhibit hair growth, suggesting that scalp hair growth may be controlled by these sex hormones.
As with male pattern baldness, female pattern baldness comes from hormone imbalances, specifically dihydrotestosterone imbalances, or DHT. This hormone is similar in structure to testosterone, but it is significantly more potent [3]. DHT can attach to receptors on the hair follicles, causing the follicles to shrink.
Too much estrogen can cause hair loss and thinning hair. Many times, an increase in estrogen is caused by perimenopause, ingesting or touching endocrine disruptor items and gaining weight. Estrogen affects the hormones, which in turn affect the ability for your hair to grow.
Lower estrogen and progesterone levels: Estrogen and progesterone stimulate hair growth, which is why pregnant women—who are producing extra levels of these hormones—tend to experience thickening hair during their pregnancy.
When the levels of estrogen and progesterone drop, hair grows more slowly and becomes much thinner. A decrease in these hormones also triggers an increase in the production of androgens, or a group of male hormones. Androgens shrink hair follicles, resulting in hair loss on the head.
Hirsutism is excess hair growth on the body or face. It's caused by excess hormones called androgens. For women, the hair may grow in places where men often have a lot of hair, but women often don't. This includes the upper lip, chin, chest, and back.
In your first 6-12 months on estrogen, people on estrogen may notice changes in their body hair, facial hair, and even scalp hair. While the full effect of hair growth changes may take up to three years to develop, they are a natural part of transitioning with estrogen.
Estrogen is related to hair growth — and hair loss. During pregnancy, for example, a woman's estrogen levels are higher than normal, which signals more hair follicles to "grow" and fewer to "rest." While estrogen levels are high, women have full, thick hair.
It depends on your situation. Not all women need, want or are candidates for estrogen therapy. Estrogen can reduce menopausal symptoms like hot flashes, night sweats and vaginal dryness. If you have a uterus, you'll likely need to take progesterone along with the estrogen.
In addition to keeping your bones strong, estrogen and progesterone keep your hair healthy. A decrease in these hormones causes an increase in androgen production which causes hair follicles to shrink and contribute to hair loss.
According to Harvard Health Publishing, topical minoxidil is the most common treatment for androgenic alopecia or hormonal hair loss as opposed to corticosteroids for non-hormonal hair loss treatment. Corticosteroids reduce inflammation and lower the immune response in alopecia areata.
A Fred Hutchinson Cancer Research Center study involving postmenopausal, overweight, and obese women who took 2,000 IUs of vitamin D daily for a year found that those whose vitamin D blood levels increased the most had the greatest reductions in blood estrogens, which are a known risk factor for breast cancer.
Low estrogen levels can interfere with sexual development and sexual functions. They can also increase your risk for obesity, osteoporosis, and cardiovascular disease.
Estrogen Excess
Just like excess testosterone and excess DHT can cause hair troubles, so can too much estrogen. For some women, excess estrogen may trigger hair loss because of a gene variant that affects the functioning of an enzyme (aromatase) that processes estrogen.
Estrogen (in women), Testosterone (in men), growth hormone, and melatonin are the hormones in the body that most commonly decrease function with age. According to Professor John E. Morley at Saint Louis University School of Medicine, “In women, the decline in estrogen levels leads to menopause.