Hair growth is regulated by hormonal changes in the body. These hormones can affect not only how much grows, but whether growth stops and no new hair grows. The processes that regulate how much does or doesn’t grow, and what type of hair grows, can go awry and cause abnormal hair growth, as well.

If you have been trying to grow your hair out with little or no luck, you could be experiencing a vitamin deficiency of some sort. Vitamins are essential to healthy hair and sustained growth.

Hair loss occurs for a variety of reasons. You may have an auto-immune disease such as alopecia or imbalanced hormones due to pregnancy or your age; genes also can dictate male pattern baldness.

A child’s hair will grow about one quarter inch each month. The hair will grow out of follicles for two to six years before entering a rest phase that lasts about three months. Following the rest phase the hair will fall out, with 50 to 100 strands a day being a normal rate of hair loss.

Laser hair restoration spurred a heated debate between conventional hair restoration surgeons and providers of laser therapies. By the time the "New York Times" reported on a nonsurgical way to restore thinning follicles called "photobiostimulation"

Men experience hair growth in a variety of areas including the back, chest, arms, legs and pubic region. Getting rid of this unwanted hair is stressful for some men. When the area is shaved, results last as little as one to three days, according to KidsHealth.org.

While prescription medications can have some unpleasant side effects, most diminish as your body adjusts to the drug. In other cases, side effects may persist or be worrisome enough that you should talk to your health care provider.

Growing out hair from a relaxer, or transitioning, may be tricky because hair breakage is a common side effect of growing out your permed hair, reports Essence.com. Additionally, relaxers, even the non-lye variety, chemically weaken the hair, making it more prone to split ends.

RevitaLash, a beauty product produced by Athena Cosmetics, is an eyelash stimulating conditioner that you apply along your lashline to make lashes grow longer, thicker and possibly darker.

Hair splinters are annoying and painful. These splinters appear when a sliver of hair lodges itself under your skin and torments you until gone. Most splinters can be removed safely from home with the proper tools and antiseptic. Once removed, there is little chance for infection.

Excessive body hair growth is quite common. According to hirsutism.com, 15 percent of women experience unwanted excessive body hair growth.

Revitalash is a formula that when applied to the base of the eyelashes, claims to help grow thicker and darker eyelashes. The U.S. Food & Drug Administration has recalled and seized previous formulas, but the latest formula for the makeup has been approved.