Background: Vertebrabasilar insufficiency is a common problem in the community and causes limitation in daily physical activities of patients. A questionnaire called the dizziness disability inventory is used to show the change in the quality of life of the patients. In our study, we wanted to show the change in quality of life indexes of patients with vertebrabasilar insufficiency depending on the degree of insufficiency. Material and metod: Dizziness disability inventory was filled in patients diagnosed with vertebrabasilar insufficiency by Doppler ultrasonography and the relationship between the degree of vertebrabasilar insufficiency and the results of the questionnaire was investigated. Results: A statistically significant difference was found between the groups according to the mean questionnaire results in patients classified as mild, moderate and severe according to their vertebrabasilar insufficiency. The mean questionnaire scores of those with severe vertebrabasilar impairment were significantly higher than those with moderate and mild impairment, but no significant difference was found between those with moderate and mild impairment. There was no significant difference in mean questionnaire scores between gender, treatment intake and duration of complaints. It was found that there was a significant decrease in total vertebral artery output depending on age. Conclusion: In patients with vertebrabasilar insufficiency, restriction in activities of daily living, deterioration in quality of life are observed. It should be noted that the decrease in the quality of life index of the patients will be higher according to the severity of the vertebrabasilar insufficiency