Lying for a long time to stand up dizziness and black eyes, may be due to postural hypotension, hypoglycemia, cervical spondylosis and other reasons. 1. Postural hypotension: after lying down for a long time and standing up, the human body suddenly changes position, blood pooling in the lower limbs, resulting in insufficient blood flow back to the heart, insufficient blood supply to the brain, thus appearing dizziness, blackness in front of the eyes symptoms. It is recommended that patients usually get up when slowing down the movement, slowly get up, to give the body time to adapt to changes in body position. 2. Hypoglycemia: When blood sugar is low, the energy supply to the brain is insufficient, resulting in dizziness and black eyes. Symptoms may become more obvious when changing positions. Hypoglycemia patients can usually moderate intake of food containing more sugar, if the symptoms of hypoglycemia is serious, you can go to the hospital, under the guidance of the doctor to supplement glucose. 3. Cervical spondylosis: degenerative cervical spondylosis will change the direction of the vertebral artery, cervical spondylosis is easy to compress the vertebral artery, the compression may be more pronounced when changing the position, resulting in insufficient blood supply to the brain, which triggers the symptoms of dizziness and black eyes. Patients can be treated under the guidance of a doctor, avoiding prolonged bowing or lifting of the head. This symptom may also be caused by other reasons, it is recommended to consult a doctor in time to clarify the cause of the disease and then treat the symptoms.