If a 4 mm intracranial aneurysm has no relevant symptoms, it can be temporarily observed without surgery; however, if the symptoms are more obvious, surgery is needed as soon as possible. If 4 mm intracranial aneurysm is detected, but the symptoms are not obvious and there are no related complications, the patient can be treated without surgery first, and regular observation is sufficient, with the purpose of regularly observing whether the intracranial aneurysm will gradually increase in size, with or without the risk of rupture and hemorrhage, and then further treatment will be carried out according to the diagnostic results. If the size of the intracranial aneurysm is 4 mm, the symptoms are relatively obvious, and the patient has symptoms such as dizziness, nausea, vomiting, etc., the patient should take surgical treatment in time, otherwise the risk is higher, which will easily cause the aneurysm to rupture and bleed, and will threaten the patient’s life in serious cases. It is recommended that patients with intracranial aneurysm should go to the hospital in time, and the professional doctors should make specific treatment plan.