The vast majority of men, and women have five lumbar vertebra, occasionally a person may have six due to a congenital deformity. This does not necessarily mean that you will develop back problems, however there is evidence that people with six vertebra suffer from increased rates of some disorders like scoliosis, i suggest if you have an extra vertebra take good care of yourself and get some sensible exercise.
I found out that I had an extra lumbar vertibrae when I was 9 along with a little scolyosis. I started my physical theapy but stopped due to the pain. I recently started a class where I'm sitting 4 hours straight. It started to hurt pretty bad so I decided to go ahead and fix this now that I have a higher pain tollerence. I'm 19 years old. I went to my chiropracter and found out my last four are compressing and my last 2 are about a jump or a jog away from compressing. I am currently laying down at 4:19 pm because of the pain. Take care of your back! Get x-rays a least every couple years to make sure your back isn't compressing. There just isn't enough room for my veribrae. Good luck!
its fairly unusal but they do not always cause problems somtimes they are perfectly shaped and function fine other times they are an irregular shape and as you said they can cause all sorts of problems
I have had spinal issues for several years now. First i was told i had spondlylolesthesis-severe etc. then later feel several times got hit by several cars and recevied new xrays to find that i had several degenerative discs,spinal stenosis-e impingement-spondylolesthesis -severe-and other stuff i cant pronounce. Recentrly a ortho said : you have a 6th vertabrae did you know that? I said no........he said yeah its looking for somewhere to go ...Basically it is not in alignement with the rest of my spine.......he said its the main reason for all my spinal issues-its like my spine is falling apart. I have alot of pain-and limited mobility.....I simply want to be normal.and be able to function like everyone else. these doctors are helping me. I live a very limited and restricted life to avoid pain-and avoid further damage.