Hydrocephalus can seriously affect the patient’s IQ, and in serious cases, it can be life-threatening, so the treatment of hydrocephalus should not be taken lightly. Because of the realization of the danger of hydrocephalus is very big, many friends want to actively understand the causes of hydrocephalus, to take effective measures to prevent the occurrence of hydrocephalus. The following is to introduce the causes of hydrocephalus. 1.Hydrocephalus caused by congenital malformations, such as midbrain aqueduct stenosis, diaphragm formation or atresia, interventricular foramen atresia malformation (fourth ventricle median foramen or lateral atresia), cerebral vascular malformations, spina bifida, cerebellar tonsillar hernia and so on. 2, infection triggered hydrocephalus intrauterine infections such as various viruses, protozoa and syphilis spirochete infectious meningitis can not be controlled early, the proliferation of fibrous tissue blocking the cerebrospinal fluid circulation orifice, or intracranial inflammation of the fetal cerebral pools, subarachnoid space and arachnoid granules can be adhesion occlusion. 3.Hydrocephalus triggered by hemorrhage can be caused by fibrous hyperplasia after intracranial hemorrhage and malabsorption of intracranial hemorrhage caused by birth injury. 4, tumor-induced hydrocephalus can block any part of the cerebrospinal fluid circulation, more commonly seen near the fourth ventricle, or choroid plexus papilloma. 5, other causes of hydrocephalus certain hereditary metabolic diseases, perinatal and neonatal asphyxia, severe vitamin A deficiency. After understanding the causes of hydrocephalus, we should actively choose effective measures for the treatment of patients. According to the cause of the treatment measures selected for the patient’s recovery is very important.