Arachnoid cysts of the occipital pool are not very serious diseases and are very common in clinical practice. Arachnoid cysts are formed when arachnoid granules are blocked during development. It is a mass of cerebrospinal fluid that is encapsulated and is all benign and not malignant. It only compresses the brain, resulting in a series of clinical symptoms. If an arachnoid cyst in the occipital pool is very large and compresses the patient’s brain, causing a variety of clinical symptoms that can seriously affect daily life, it needs to be treated promptly. Otherwise, if it is very small or does not compress the brain tissue and does not cause severe clinical symptoms, it does not require specific treatment. Occasionally, it may cause dizziness and headache, which can be relieved by taking oral medication and does not require special treatment.