When patients get up with black eyes, it may be related to upright hypotension, anemia, hypoglycemia and so on. 1. Upright hypotension: when standing upright, due to the effect of gravity leads to a large amount of blood perfusion to the lower limbs, causing a decrease in the volume of return blood, patients may have the symptom of darkness in front of the eyes, which is usually relieved after sitting down. 2. Anemia: due to the decrease of peripheral blood red blood cell capacity in patients with anemia, the change of body position may cause insufficient blood supply and oxygen supply to the brain, resulting in the appearance of darkness before the eyes. 3. Hypoglycemia: If the patient’s blood sugar is too low, when the body position is changed, it will cause insufficient supply of brain energy, and then there will be darkness in front of the eyes. It is recommended that patients with frequent darkening of the eyes should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.