Smog is a disease that many people may not have heard of. When you first hear about this disease, some people may think that it is a lung disease caused by smoking, but it is not. Smoke disease is a cerebrovascular disease that is caused by chronic progressive narrowing or occlusion of the main arteries of the brain, followed by abnormal changes in the vascular network at the base of the skull, resulting in small, fragile, smoke-like vessels. Smoke disease can cause cerebral ischemia, which in many cases manifests primarily as transient ischemic attack (TIA), with common symptoms of transient vertigo, nystagmus, and unsteadiness in standing or walking. Transient double vision or visual field defects, etc. Transient dysphagia, choking on water, slurred speech or hoarseness. Transient unilateral or bilateral limb weakness, abnormal sensation. Transient hearing loss, crossed paralysis, mild hemiparesis and bilateral mild paralysis. Rarely, there may be impaired consciousness or sudden collapse episodes. In addition, smog can also cause acute cerebral infarction or cerebral hemorrhage, which is more serious. So how does this smog disease develop? The specific pathogenesis of smog is not yet well understood by the medical community. Some scholars have found that mothers and sons or siblings in individual families can have similar disease, which is considered to be related to congenital factors. However, based on clinical, pathological, immunological and laboratory studies, most scholars believe that this is a group of occlusive cerebrovascular diseases that occur later in life and may be related to allergic cerebral vasculitis. There is a consensus in the medical community for the treatment of smog, which is that surgical treatment is needed as soon as the diagnosis is clear. The current combined vascular bypass surgery for smog can achieve very good results. This procedure combines direct bypass and indirect bypass to maximize the reconstruction of intracranial blood supply channels, improve brain blood supply to a greater extent, and effectively prevent the occurrence of cerebral hemorrhage.