I had a lumbar drain for a few days after AN surgery. It was done sometime during surgery, in the lower back area, while I was "asleep", and did not hurt at all. It was taken out either the day before or the day they let me out of the hospital. I was aware that the lumbat drain was there, but it really didn't bother me as far as sleeping, or getting out of bed and walking around, etc. I think the lumbar drain is there to make sure that cranial fluid pressure is low, allowing the skull intrusion area to heal up as fast as possible, which minimized possible infection of CSF (meningitis), and perhaps allowing for some swelling without cranial pressure going up. Don't worry about a lumbar drain, it really won't bother you.