If you have one or more Tarlov cysts, please complete this survey. We also need your friends without Tarlov cysts (2 would be great) to complete relevant sections. They will serve as our comparison group. They should be of at least 18 years of age. We sincerely hope you can complete all applicable sections, because your inputs will contribute greatly to the understanding of this condition. All records are kept strictly private: only anonymous statistics are published. All question with a * must be answered and the last question with a * is question 22. If you get back pain during the survey, get up, stretch and come back to the survey later! . Thank you very much.