Vomiting can occur in patients with insufficient cerebral blood supply, mainly in patients with insufficient blood supply to the vertebral basilar artery system. Patients with insufficient blood supply to the vertebral basilar artery system may have symptoms of ischemia and hypoxia in the cerebellum and brainstem, which may be manifested as dizziness, nausea, vomiting, as well as balance and ataxia disorders, and in some cases dysphagia and choking on drinking water may also occur. Cerebral insufficiency of blood supply can occur in middle-aged and elderly people, but also in young people. Most of the middle-aged and old people are caused by atherosclerosis, high blood fat and high blood sugar; young people are caused by mental tension, stress, sleep disorders, and may also be caused by prolonged looking down at the cell phone, playing the computer. Insufficient blood supply to the brain can be clinically categorized into insufficient blood supply to the internal carotid artery system and insufficient blood supply to the vertebral basilar artery system. Patients with insufficient blood supply to the internal carotid artery system are mainly characterized by episodic sensory and motor disorders and vegetative nerve disorders in the lateral limbs, and may also suffer from hemianopsia, and some patients may also suffer from speech dysfunction.