Most people do not know what smog is and do not understand the dangers of smog. So if congenital smog is not operated on and it comes back, is it life threatening? Is surgery necessary? Today we will answer each question. Smoke disease is a rare cerebrovascular disease, there are congenital and acquired, according to information, genetic factors account for 10%, the main groups affected are under 10 years old and middle-aged people over 40 years old. Like all diseases, smog does not heal on its own, but only worsens. In case of a seizure, the patient may experience transient paralysis, weakness, seizures, and acute stroke, which may lead to persistent paralysis, aphasia, visual impairment and mental retardation, and dementia or mental decline in children with severe or prolonged ischemia. At present, the pathogenesis of smog is not clear, but through decades of clinical evidence, conservative treatment for smog is useless and does not achieve the preventive effect, and can only temporarily relieve cerebral ischemia, but cannot treat the root of smog. Surgery can perform the reconstruction of blood vessels to form bypass vessels, which can effectively improve the problem of cerebral ischemia, so after the diagnosis of smog disease, it is still necessary to operate as soon as possible. Combined vascular bypass surgery has been used to achieve good results in clinical practice. According to the introduction, this treatment is equivalent to the south-to-north water transfer, our blood vessels have to introduce the blood flow from outside the skull into the brain. But the human brain tissue has a layer of bone, which is an obstacle, and it is necessary to introduce the blood flow from outside the skull into the brain through surgical methods. In this way, we can really improve the symptoms of cerebral ischemia effectively.