i finally found the causes of herniated discs. Usually men between the ages of 30 to 50 are the ones who suffer herniations. Here are the most common causes:
Improper lifting
Body weight
Repetitive activities that strain the spine
Frequent driving
Sedentary lifestyle
Smoking
I found it at
www.orthoinfo.aaos.org/topic
There was a lot of info there. Take care! Hugs, Lee