The vast majority of patients recover well after surgery for chronic subdural hematoma, and sequelae will rarely remain, unless the amount of hematoma before surgery is very large, the pressure on brain tissue is very obvious, and the patient has developed severe limb paralysis, dementia, memory loss, incontinence, or impaired consciousness, coma and so on, and the patient may be left with sequelae of varying degrees after surgery. If the patient’s limbs are completely paralyzed before the surgery, the patient’s muscle strength may not be fully restored after the surgery, hemiparesis of the limbs occurs or the patient’s brain tissue is not reset satisfactorily after the surgery, and subdural effusion or recurrence of hematoma occurs, which requires a second surgery. Hematoma can also cause coma, after surgery, the patient’s consciousness is not fully recovered, there is a long period of coma, or hematoma compression of brain tissue caused by cerebral vasospasm, resulting in cerebral infarction, which can lead to severe cerebral infarction for a long period of time, resulting in the patient’s consciousness, paralysis of the limbs, and urinary and fecal incontinence, and other sequelae.