An unhealthy scalp environment can play a significant role in hair thinning by contributing to miniaturization or causing damage.[citation needed] Air and water pollutants[citation needed], environmental toxins,[citation needed] conventional styling products and excessive amounts of sebum have the potential to build up on the scalp.[citation needed]. This debris can block hair follicles and cause their deterioration and consequent miniaturization of hair.[citation needed]. It can also physically restrict hair growth or damage the hair cuticle[citation needed], leading to hair that is weakened and easily broken off before its natural lifecycle has ended.[citation needed]
Beginning at perimenopause in their 40s, women may see the effects of menopause on hair, including thinning hair, dull, graying and hair loss. Experts previously thought hair loss due to menopause was caused by low estrogen levels. But new research shows that hair loss in older women is likely due to lower levels of both estrogen and progesterone, causing hair follicles to thin and hair to fall out.

Less common causes of hair loss without inflammation or scarring include the pulling out of hair, certain medications including chemotherapy, HIV/AIDS, hypothyroidism, and malnutrition including iron deficiency.[2][3] Causes of hair loss that occurs with scarring or inflammation include fungal infection, lupus erythematosus, radiation therapy, and sarcoidosis.[2][3] Diagnosis of hair loss is partly based on the areas affected.[3]
Hi there – I just wanted to submit a comment because I dealt with hair loss as a 25 year old. I am 26 now and my hair is back to its normal thickness. I went through a stressful period in my life when I was not getting enough sleep, not eating enough healthy foods and generally just not taking care of myself. I was suffering from a lot of anxious feelings and depression.
Buy Nizoral shampoo at the grocery store. Ketoconazole, the primary ingredient in Nizoral, was proven in a Belgian study entitled, "Ketoconazole Shampoo: Effect of Long-Term Use in Androgenic Alopecia," published in the 1998 Journal of Dermatology to be as effective for stimulating hair growth and increasing hair density as two percent minoxidil. Researchers considered ketoconazole a promising addition for the long-term treatment of androgenic alopecia.
your situation is very common and I assume you have had a thorough investigation ruling out any medical condition for your hair thinning. Minoxidil may restore some vellus hair but unlikely to result in significant terminal hair. As long as it is not getting worse, then a hair transplant procedure may be the answer for you to restore the feminine shape to your hairline 

During this procedure, surgeons remove a narrow strip of scalp and divide it into hundreds of tiny grafts, each containing just a few hairs. Each graft is planted in a slit in the scalp created by a blade or needle in the area of missing hair. Hair grows naturally this way, in small clusters of one to four follicles, called follicular units. As a result, the graft looks better than the larger "plugs" associated with hair transplants of yesteryear.
Sleep helps all our bodily functions and alow the body to build, repair and restore order. Have a calming bed-time routine such as a lavender bath, avoid stress and technology before bed and try to sleep in a darkened room if possible. Healthy sleep will help to rebalance hormones and nourish the adrenal glands which are the glands that produce stres hormones like cortisol.
Also new is the HairMax Laser Comb. It's a red light therapy hairbrush-like device that increases circulation and the biological march that makes hair. It's only approved in men (though some women are using it) and in my experience, is not as good as minoxidil. But in one study, 45% of users reported improvement after eight weeks, and 90% saw improvement after 16 weeks. 

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If follicles receive the necessary stimulus and nutrients from the body, it can stabilize hair loss during menopause and strengthen existing hair growth. This is why it’s important to nourish thinning hair follicles with the right nutrients, including marine extracts, vitamins (including B vitamins such as Biotin and Niacin) and minerals (such as Zinc), to promote hair growth during menopause. A good diet, as well as a nourishing shampoo and conditioner that is gentle on dry, aging hair, are top tips for how to treat menopause-related hair loss.
Though not as common as the loss of hair on the head, chemotherapy, hormone imbalance, forms of hair loss, and other factors can also cause loss of hair in the eyebrows. Loss of growth in the outer one third of the eyebrow is often associated with hypothyroidism. Artificial eyebrows are available to replace missing eyebrows or to cover patchy eyebrows. Eyebrow embroidery is another option which involves the use of a blade to add pigment to the eyebrows. This gives a natural 3D look for those who are worried about an artificial look and it lasts for two years. Micropigmentation (permanent makeup tattooing) is also available for those who want the look to be permanent.
Phytoestrogenic herbs, such as ginseng or black cohosh, contain estrogenic components produced by plants. These herbs, at first, do treat the underlying hormonal imbalance by introducing these plant-based estrogens into the body. However, as a result of adding outside hormones, a woman's body may become less capable of producing estrogen on its own. This causes a further decrease of the body's own hormone levels.
However, both men and women are able to use the MHRA licensed and FDA-approved minoxidil – a dose-dependent drug which is applied topically to the scalp where needed to promote hair growth. Various formulations of high strength minoxidil are available for men and women and can form part of a targeted treatment course aimed at stopping shedding and encouraging regrowth.
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