Several different things can cause pain in the lower back, such as arthritis, obesity, kidney stones and blood clots. Even though these conditions can lead to pain in the lower back, they aren't the most common cause of the problem. The number one reason why people suffer with back pain is that their spine is not in proper alignment.
Chiropractors are specially trained to locate subluxations and eliminate them. Subluxation is a term that chiropractors use to describe a spinal joint that is not functioning properly and often not aligned as it should be. by removing the pressure on nerves pain can be reduced and normal function can return.
If you are suffering with pain in your back, it will more than likely get worse before it gets better. Other functions in the body may be adversely affected by the subluxation as well. The pain is like an alarm alerting you to the problem. Do not confuse pain hiding measures like drugs with finding the cause and addressing it (what chiropractors do).