The risks of hydrocephalus drainage include intracranial hemorrhage, recurrence of hydrocephalus due to blockage of the drainage tube, excessive drainage of cerebrospinal fluid, intracranial infection and abdominal infection. 1. Intracranial hemorrhage: the surgery requires puncture into the ventricles of the brain, and the puncture process can easily induce hemorrhage in the puncture channel of the brain. 2. Recurrence of hydrocephalus caused by blockage of drainage tube: the aperture of the shunt tube is small, the protein content in cerebrospinal fluid is high, the texture is sticky, and the brain tissues or blood clots enter into the catheter, which can lead to the blockage of the catheter. The patient may experience recurrence of hydrocephalus and need another surgery to replace the blocked drainage system. 3. Excessive drainage of cerebrospinal fluid: If the drainage pressure is not balanced, excessive drainage may lead to headache and nausea. 4. Intracranial and abdominal infections: Since the drain placed is a foreign body, it does not have the ability to resist infection and has a long passageway, it is easy to cause intracranial and abdominal infections. If you suffer from hydrocephalus, it is recommended that you consult a doctor in time and carry out standardized treatment under the guidance of the doctor.