What causes dark circles under the eyes?

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Possible causes Hyperventilation Syndrome (over breathing) lack of vitamin C iron deficiency vitamin K deficiency low sodium/potassium ratio: 1.24 mg. Ideal is 2.5 mg. A Low sodium/potassium ratio can be associated with kidney and liver stres lack of sleep or poor sleeping habits allergies, including hay fever hyperpigmentation, which happens when the body produces more melanin reduced levels of fatty …