Causes For Hair Loss

Thinning hair is a normal part of aging, but hair loss that exceeds the growth of new hair or that comes out in patches can lead to baldness.

There are approximately 100,000 hairs on the scalp, and the average hair loss is 50-100 hairs a day. There are two stages to hair growth. The growth stage is known as anagen.

During this phase hair grows about a half inch, or a centimeter, and lasts for two to three years. The second phase, telogen, is a resting phase and lasts three to four months.

At the end of this phase the hair falls out and a new one begins, which starts the cycle over again. There are many possible causes for hair loss. Hormonal imbalances, caused by pregnancy, menopause, birth control pills, and/or thyroid problems may cause temporary hair loss.

Hormonal change can cause hair loss to be delayed by three months, with another three months delay in new growth. Pregnancy often causes an improvement in hair, but after delivery hair loss can exceed the normal rate.

An overproduction of testosterone can cause thinning over the crown, but may be alleviated by correcting the imbalance. Other causes of hair loss involve nutrition.

Poor nutrition, either from improper diet or an eating disorder, or inadequate nutrients such as lack of protein or iron can cause hair loss.

The manipulation of hair, including chemical treatments like changing hair color or structure (permanents or straightening), or styling or brushing too much can also lead to hair loss.

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