Heavy dark circles under the eyes are considered to be caused by poor rest, abnormal blood circulation, conjunctivitis and other reasons, but the specific causes should also go to the hospital in time for examination and confirmation. 1. bad rest: if you stay up late for a long time, insomnia, poor quality of sleep, resulting in poor rest of the body, the phenomenon of heavy dark circles under the eyes will occur. 2. Abnormal blood circulation: The area around the eyes is in a state of fatigue, resulting in slowing down of blood velocity and insufficient oxygen supply to the local skin, causing abnormal blood circulation, which leads to pigmentation, and can manifest the phenomenon of heavy dark circles around the eyes. 3. Conjunctivitis: Conjunctivitis causes blood to stagnate around the eyes and the blood flow to slow down, causing pigmentation in the blood, which leads to the symptom of heavy dark circles around the eyes. There are many reasons for heavy dark circles under the eyes, and when symptoms appear, if they are not relieved after resting, it is recommended to go to the hospital in time for a relevant examination and diagnosis, and then follow the doctor’s instructions to carry out targeted treatments, so as to avoid negative impacts on the body’s health.