Cerebral arachnoid hemorrhage generally refers to subarachnoid hemorrhage, which may be caused by rupture of intracranial blood vessels triggered by disease or trauma. Sequelae such as hydrocephalus, cerebrovascular spasm, hemiplegia and epilepsy are common. It is recommended to actively cooperate with doctors in the early stage of the disease and maintain good living habits, which can reduce the possibility of serious sequelae. Common sequelae include: 1. hydrocephalus: clots in the subarachnoid space may block the flow channels of cerebrospinal fluid, affecting cerebrospinal fluid circulation, which may cause cerebrospinal fluid retention and hydrocephalus, leading to recurrent seizures, personality changes, cognitive and speech dysfunction, mental decline, urinary incontinence, etc.; 2. cerebrovascular spasm: subarachnoid hemorrhage may cause cerebrovascular partial contracture, which may lead to dizziness, headache and other head discomfort symptoms; 3. hemiplegia: if subarachnoid hemorrhage causes brain herniation complications, it may lead to the sequelae of hemiplegic limb paralysis. The common manifestation is abnormal function of the hemiplegic limb, which may be accompanied by numbness of the limb, etc.; 4. Epilepsy: Patients with subarachnoid hemorrhage may develop epileptic symptoms after recovery, and need to be treated with oral antiepileptic drugs.