Most Common Causes of Dark Circles under eyes

Thinning skin

The skin under the eyes is thin and delicate to begin with. As we age, skin and the fat pad under the eyes becomes thinner, causing blood vessels to become noticeable. This gives the appearance of dark circles.
Sun damage can make it worse because it weakens skin.

Allergies and Hayfever

Dark circles under the eyes can be the result of allergies to airborne substances, such as pollen, dust, and pet dander, because people rub their itchy eyes. People with hayfever may notice them at the height of the season. Food allergies or sensitivities can also contribute to dark circles.

Genetics

Dark circles under the eyes runs in families. They tend to be more noticeable in people with fair skin or deep-set eyes.

Fluid Retention

Blood vessels under the eyes can become dilated and engorged, which can contribute to dark circles. Excess dietary salt and smoking are common causes. Conditions that cause fluid retention (e.g. heart, thyroid, kidney, liver diseases) or medications that cause blood vessel dilation may be a factor. Your doctor should be aware of any symptoms you’re experiencing.

Lack of sleep

A lack of sleep can make skin appear more pale, which allows blood vessels to be more visible through the skin, giving the appearance of bluish or dark circles.

Iron Deficiency Anemia

Iron deficiency anemia may cause a bluish tinge below the eyes.

Dehydration

Dark circles under the eyes can be a sign of dehydration.

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