Can hydrocephalus recur after surgery? This is a question that almost all hydrocephalus patients and their families ask. Before answering this question, please first think about this: In everyday life, when a sewer is clogged, will it clog again after being unclogged? In fact, the problem of post-operative recurrence of hydrocephalus is similar to a blocked sewer that is unclogged and then re-clogged. If there is always sewage entering the sewer, the chances of sewer blockage are higher; if the sewer goes in clear water, the chances of blockage are relatively less. The same is true for recurrence after hydrocephalus surgery. If the protein content in the cerebrospinal fluid is high, that is, if there are more impurities in the water, then there is a higher chance that the cerebrospinal fluid circulation pathway will be blocked again after surgery; if there are fewer impurities in the cerebrospinal fluid, then the postoperative results will be good. Therefore, regardless of the treatment modality for hydrocephalus, whether it is cerebrospinal fluid shunt surgery or endoscopic cerebrospinal fluid circulation pathway unblocking surgery, the effect is not permanent, which means that there is a possibility of “recurrence”. Endoscopic unblocking of the cerebrospinal fluid circulation has the potential for re-infarction, and blockage of the shunt after cerebrospinal fluid shunt surgery has always troubled neurosurgeons. Hydrocephalus is still incurable today, and its treatment emphasizes “lifelong treatment”. In other words, after the hydrocephalus surgery, you should always keep in close contact with your doctor, and if there are any special circumstances after the surgery, you should promptly inform your doctor that you have had hydrocephalus surgery and get help from him/her.