Back pain can be caused due to a number of reasons. Usually mild back pain does not require immediate medical attention. Back pain usually occurs due to inflammation. Sometimes back pain can be indicative of a serious medical condition like bone fracture, spinal fracture, multiple myeloma, osteoporosis, cancer, lumbar disc herniation, degenerative disc disease etc. Stress and dysfunctional family relationships are also known to causeback pain. During pregnancy majority of women experience low back pain which can be severe during the third trimester.
The most common cause of kidney pain is kidney stones. These stones get lodged in the ureter blocking urine flow causing severe pain which has been comparable to labour pains. Kidney pain is also caused due to pyelonephritis or kidney infection. Pain occurs due to infection ad inflammation of pain sensitive capsule that surrounds the kidney. Both these kidney pains are accompanied with fever, nausea and vomiting unlike back pain. Bleeding within kidney due to injury and cancer in the kidney are also pain attributing causes. Dull aching pain in kidney can be caused due to polycystic kidney disease, gradual blockage of urine flow etc.