Many people suffer from dark circles under or around the eyes. Dark circles under eyes make people look tired and exhausted, if not unhealthy, and can occur due to a wide variation of reasons. Dark circles eyes happen to people in all ages groups but seem to occur more in women. Why do they arise? There are a number of causes of dark circles under eyes some of which are: Rubbing the Eyes a Lot due to lack of sleep or itchy eyes that occur in dusty rooms or if one suffers from an allergy, for example hay fever Sleep difficulty (possibly due to stress or depression). Allergies Hay fever and dust allergies are known to cause dark circles under eyes. Dehydration As the skin under the eye is so close to the underlying bone, a lack of water in the body will become apparent in this area when the body is dehydrated. This will show up as a dark circle around or under ...