If the dizziness lasts for a few seconds when lying down and getting up, consider paroxysmal benign positional vertigo, vertebral artery cervical spondylosis, postural hypotension and so on. 1. Paroxysmal benign positional vertigo: this disease is characterized by transient vertigo when the head position changes, which can be manifested as dizziness lasting for a few seconds when lying down and getting up. 2. Vertebral artery type cervical spondylosis: this disease is caused by ligament calcification, intervertebral disc herniation, osteophytes and other compression of the vertebral artery, which aggravates the condition when the head position is changed, and there are dizziness and vertigo symptoms when lying down and getting up. 3. Postural hypotension: when the blood pressure drops suddenly after changing the body position, the blood supply to the brain is insufficient, and the patient will experience dizziness and lightheadedness lasting for a few seconds. The symptoms of dizziness lasting for a few seconds after lying down and getting up should be taken seriously. If necessary, consult a doctor to clarify the cause of the disease, targeted treatment.