Often, lower back pain and its treatment depend on the triggering event. is it something that has been around for some time, something that has started after lifting a bucket of water or moving a heavy object in a bending posture (this would mean an acute strain). Many people have a backache due to odd posture while sitting in front of computers or office for long hours. It can even be due to a problem in the tailbone (coccydynia) or a simple infection the gluteal cleft(pilonidal sinus). Many people around the age of 40-50 have a low calcium that adds to a backache.
So, if it is unusual for you, at least see your regular doctor or orthopedic doctor close to you.
Try correcting your posture, aviod stooping or a slouching posture. Reduce weight if you are obese or overweight. Try to walk for 5-10 minutes if you are in the office for long hours. Sleeping on the floor without a soft bed or a big pillow also helps.
Ginger tea can use used to substitute regular tea and coffee to relieve the backache.
Common herbal oils, that have analgesic and anti-spasm properties can be used (eucalyptus oil, Himalaya pain relief oil etc).
You can follow the exercises carefully because some actually worsen the backache.
Simple exercises would be to lie down flat, stretch your arms, draw your knees up keeping the feet flat and then gently trying to move the legs and the hip to the right and left so that the knees touch the ground on either side without lifting the shoulders off the ground.
The simple prayer position of kneeling down and then streching the arms to touch the ground in front of us with the back in a gentle arc also helps.