Sporting a full head of beautiful, shiny hair is something most people want. When your hair starts thinning and your scalp starts showing, however, you will likely want to take some form of action. Thinning, lackluster hair is treatable. A poor diet may be a contributing factor to limp, lifeless hair.

Understanding what causes hair to turn white–or gray or silver–involves taking a close look at the structure of the hair itself.

Some children are born with a full head of thick locks, but others retain a sleek, bald scalp well into their toddler years. In most cases, toddlers with little or no hair are perfectly healthy, but persistent baldness may be a sign of an underlying medical condition.

For sufferers of traction alopecia, the key to curing it begins with changing hairstyling methods. Pulling hair tightly into ponytails or braided hairstyles may trigger permanent hair loss. Dermatologist Dr. Jeffrey Benabio says traction alopecia causes scarring of the hair follicle.

Hair loss is often a normal and expected part of aging. Hair naturally thins with age, and hormonal changes and genetic influences can lead to hair loss, particularly in men. But the aging process does not explain excessive or abnormal hair loss, also known as alopecia.

Running is supposed to increase how far you can go before losing your breath. However, beginners may find that they've hit a wall where they get winded before running far enough to start getting into better shape. There's no one simple solution to this problem, because different causes can lead to this symptom.

The immune system, which includes bone marrow, thymus, spleen, lymph nodes and the white blood cells, functions to recognize and eliminate foreign invaders. When the immune system fails to differentiate between foreign invaders and normal healthy cells, autoimmune disease results.

Inflamed and infected hair follicles are the defining features of a medical condition formally called folliculitis. Hair follicles become irritated when something damages them, according to MedlinePlus.

Eyebrows are needed to keep sweat from our forehead from running over our eyes. In addition, eyebrows can be groomed to enhance the aesthetics of your face. However, there are several causes of eyebrow hair falling off such as the alopecia and dermatitis skin diseases, accidents, bacteria, or excessive plucking.

Receding hairlines are a common problem for both men and women, with issues being more common in men. Receding hairlines can be caused by a variety of factors ranging from genetics and aging to hormones and disease.

Thin, fragile hair and brittle, breakage-prone nails are often part of the normal aging process. Overdoing cosmetic treatments like chemical hair processes and manicures with artificial nails or dark polish can also damage your hair and nails over time.

When men lose their hair it is looked upon as a natural consequence of aging. For women, the loss of hair can be a source of significant embarrassment. Surprisingly, according to the American Hair Loss Association, women make up 40 percent of those who lose their hair.