Pain in my lower back was only on the right side. started after being sick last week. drank over 3l of water yesterday to try and help. pain is less intense but has not gone away. this morning i felt it on the right and left side. kidneys or stress?

Back pain: Since both sides of the back are involved, I favor a musculoskeletal cause of your discomfort and would treat with warm, moist applications 20 minutes 4 times a day. You could also apply liniment like bengay. If you can take them, anti-inflammatory medications like ibuprofen or naproxen should provide relief. Good fluid intake is still a good idea when taking these medications.