I have been having discomfort in my lower back on both sides.  I have increased my water consumption and havew also been drinking cranberry juice.  My son had kidney surgery 35 yrs ago and they discovered a horseshoe kidy.  I was told this was hereditary but have never had any problems until now.
HiT hanks for your query. After going through your query I came to know that you are suffering from chronic backache. It may be due to vitamin and trace element deficiencies specially vitamin D and vitamin B 12. You can get vitamin D and vitamin B12 levels and if found low you can take its supplements of vitamin B12 and D3. You need to do MRI to rule out other causes. Back exercises, neurotrophic such as mecobalamine and analgesics such as Ibuprofen give relief. Avoid long continuous standing. As you are worried about kidney disease is also advised to exclude kidney related causes by ultrasound of kidney and abdomen. 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. Wishing you a good health. Take care.