Hello Doc.  My mother has degenerative disc disease which has caused me to look more into my own symptons.  My lower back is sore many nights, usually needing a rub to soon the sharp pain....when I walk or move or sit - i feel as if my lower back is popping or the discs are rubbing - it sounds and feels like when you pop you knuckles.  It does not come with severe pain but the sound is concerning and I am now more concerned with my mothers recent update on her health.
HiT hanks for your thereafter going through your query I came to know that you are suffering from chronic backache. It may be early lumbar spondylosis. It can be confirmed by x-rays. MRI of spine rule out other causes. Back exercises, Diapering, glucosamine sulfate, neurotrophic such as methycobalamin and analgesics such as diclofenac slow release tablet can give relief. Serum vitamin D test is advised if it is lower than vitamin D supplementation will be required. Avoid long continuous standing. Sit in a straight posture. You can discuss with your treating Doctor about it. I do hope that you have found something helpful, and I will be glad to answer any further query. Take care.