A black eye when getting up may be caused by postural hypotension, anemia and other reasons. 1. Postural low blood pressure: a black eye when you suddenly get up, may be caused by postural low blood pressure, sedentary or squatting, if you suddenly stand up, the blood pressure is not regulated in time, it will cause insufficient blood supply to the brain, may appear black eye, dizziness and other symptoms. Can be seen in the normal population, can also be seen in the multi-system atrophy and other diseases. 2. Anemia: If the symptom of blackness in front of the eyes when getting up occurs frequently, it may be caused by anemia and other diseases. Long-term sitting or squatting will lead to slow blood return to the lower limbs, and the blood return flow will decrease, and the symptom of blackness in front of the eyes may occur when standing up. Patients who have a black eye when they get up should go to the hospital as soon as possible for examination and standardized treatment under the guidance of the doctor.