It depends. The dark circles make you look old and unhealthy. Usually, dark circles are considered a sign of tiredness, lack of sleep, stress, effect of sunlight. However, some serious illness can also cause dark eye circles. For example, people suffered from heart, kidney and thyroid gland disease can make them appear dark circles under eyes. So, I can hardly to tell if you got serious illness or not. Just check it by a doctor. Best wishes.