Correctable risk factors should be included in the treatment component regarding intracranial aneurysms. Among the following risk factors, the most significant correctable risk factors include: smoking, hypertension, and alcohol abuse. Smoking The effect of smoking on aneurysms is significant, and although the cause is unknown, an imbalance in the ratio of elastase to a1 antitrypsin or an increase in elastase in the serum of smokers can lead to the formation of aneurysms and the development of subarachnoid hemorrhage 1. Aneurysm formation: smokers have a high incidence of multiple aneurysms; 2. Aneurysm growth. Smoking is closely related to the growth of unruptured aneurysms; 3. Rupture of aneurysms Smokers are twice as likely or more likely to have aneurysms than nonsmokers; 4. Vasospasm Smokers have a higher chance of developing symptomatic vasospasm after subarachnoid hemorrhage. Hypertension Hypertension is a risk factor for subarachnoid hemorrhage. Alcohol abuse Along with the two risk factors of smoking and hypertension, alcohol consumption (>2 times/day) increases the risk of subarachnoid hemorrhage. Drinking more than physiologically necessary should be advised to reduce the amount of alcohol consumed. Oral contraceptives There are systematic studies both for and against the increased risk of subarachnoid hemorrhage in patients taking oral contraceptives. Atherosclerosis Elevated plasma cholesterol may increase the risk of subarachnoid hemorrhage. Coffee consumption Coffee consumption (>5 cups/day) is an independent risk factor for subarachnoid hemorrhage.