What causes it?
The two most common reasons for lower back nerve pair is from a pinched nerve or herniated disc caused by muscle imbalances, which are the result of "postural dysfunctions." These dysfunctions put abnormal pressure on the disc that will cause increased wear and tear over time. Eventually, the weak spot will give way and make contact with the nerve, bringing you pain.
If your pinched nerve is not due to a disc-related problem, understand that muscle imbalances can change the position and the pull of muscles. When this happens, these muscles - as well as other structures - can put abnormal pressure on the nerve (or pinching it) and cause pain.
It is important to understand that the neither the pinching nor the increased pressure on a nerve happen overnight. You may be come symptomatic very quickly, but it takes a long time before conditions are right for the nerve to be put under enough pressure to cause pain.
