what causes the appearance of "bags" under one's eyes?

It's caused when the orbital fat which lies deep to the eye socket, starts to bulge forward due to weaking of the tissues, muscle and skin in the eye area. This causes bulging fat, known as eye bags. HTH.

Heredity

Like varicose veins, dark circles under the eyes are usually an inherited trait. If you have dark circles, there is a good chance that others in your family also have them. The skin under the eye is very thin. When blood passes through the large veins close to the surface of the skin it can produce a bluish tint. The more transparent your skin -- also an inherited trait -- the darker the circles appear.

Bone structure

If you have deep-set eyes, shadowing contributes to the dark color under the eyes.

Pigmentation

Genetic hyper-pigmentation is a common form of dark circles. Even in darker skinned people, exposure to sunlight, especially during the summer months, can cause a higher-than-normal level of skin pigmentation (melanin) under the eyes. People get sun tans because exposure to the sun increases the natural pigmentation of the skin and draws that pigmentation to the surface. The same principle applies to the skin under the eyes.

Allergies, asthma, and eczema

Any condition that causes the eyes to itch can contribute to darker circles due to rubbing or scratching the skin around them. Hay fever sufferers particularly will notice under-eye "smudges" during the height of the allergy season. Some food allergies can also cause the area under the eyes to appear darker.

Medications

Any medications that cause blood vessels to dilate can cause circles under the eyes to darken. Because the skin under the eyes is very delicate, any increase blood flow shows through the skin.

Lack of nutrition

The lack of nutrients in the diet, or the lack of a balanced diet, can contribute to the discoloration of the area under the eyes. It is believed that lack of mineral iron can cause dark circles as well.

Fatigue

A lack of sleep or excessive tiredness can cause paleness of the skin, which again allows the blood underneath the skin to become more visible and appear more blue or darker.

Pregnancy and menstruation

The skin can also become more pale during pregnancy and menstruation (due to lack of iron), which again allow the underlying veins under the eyes to become more visible.

Age

If you have a propensity to have dark circles under you eyes, as you grow older, they are likely to become more noticeable and permanent. Excess folds of skin under the eyes will also make dark circles more pronounced.

Blood Circulation

Another cause may be bad blood circulation. Cardio exercise increases blood circulation and may help the dark circles to disappear.

Kidney or Liver problems

The area directly located under the eyes are close related to kidneys and liver, so the appearance of dark circles may indicate problems or weakness in the kidney or liver activity.

Dehydration

Dark eye circles could by a sign of excessive loss of water from the body (dehydration)

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Many things. Tiredness, Aging, Allergies.

Have no Idea, but I think that its hereditary, my husband and I will get little sleep, he gets huge bags I don't even have a sign that I didn't sleep (my mom is in her 60's and looks very young)

Eyes are windows of the soul.

"Bags" appear when your soul is weary, sad, stressed.

When you sleep, make sure your eyes are completely relaxed, like falling flat on the bed. Don't *hold* on to it. Just feel safe.

Poor sleep.

I know that vitamin K creme makes them disseappear

some people just have natural "bags" under their eyes. but most just get them when they just wake up or are tired.

Too much bed, but not enough sleep??